diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 4a01950a..480b4c0c 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -5,11 +5,14 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="4c558d98-824e-4a48-ba48-bd2e6172f9f4" name="更改" comment="修改定位信息 0323">
-      <change beforePath="$PROJECT_DIR$/backend/src/main/java/com/unis/crm/service/impl/ExpansionServiceImpl.java" beforeDir="false" afterPath="$PROJECT_DIR$/backend/src/main/java/com/unis/crm/service/impl/ExpansionServiceImpl.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/backend/src/main/resources/mapper/expansion/ExpansionMapper.xml" beforeDir="false" afterPath="$PROJECT_DIR$/backend/src/main/resources/mapper/expansion/ExpansionMapper.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/backend/src/main/java/com/unis/crm/controller/OpportunityController.java" beforeDir="false" afterPath="$PROJECT_DIR$/backend/src/main/java/com/unis/crm/controller/OpportunityController.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/backend/src/main/java/com/unis/crm/mapper/OpportunityMapper.java" beforeDir="false" afterPath="$PROJECT_DIR$/backend/src/main/java/com/unis/crm/mapper/OpportunityMapper.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/backend/src/main/java/com/unis/crm/service/OpportunityService.java" beforeDir="false" afterPath="$PROJECT_DIR$/backend/src/main/java/com/unis/crm/service/OpportunityService.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/backend/src/main/java/com/unis/crm/service/impl/OpportunityServiceImpl.java" beforeDir="false" afterPath="$PROJECT_DIR$/backend/src/main/java/com/unis/crm/service/impl/OpportunityServiceImpl.java" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/backend/src/main/resources/mapper/opportunity/OpportunityMapper.xml" beforeDir="false" afterPath="$PROJECT_DIR$/backend/src/main/resources/mapper/opportunity/OpportunityMapper.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/frontend/src/pages/Expansion.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/src/pages/Expansion.tsx" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/frontend/src/pages/Work.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/src/pages/Work.tsx" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/backend/src/test/java/com/unis/crm/service/impl/OpportunityServiceImplTest.java" beforeDir="false" afterPath="$PROJECT_DIR$/backend/src/test/java/com/unis/crm/service/impl/OpportunityServiceImplTest.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/src/lib/auth.ts" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/src/lib/auth.ts" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/frontend/src/pages/Opportunities.tsx" beforeDir="false" afterPath="$PROJECT_DIR$/frontend/src/pages/Opportunities.tsx" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -103,6 +106,7 @@
       <workItem from="1776219416113" duration="650000" />
       <workItem from="1776238420843" duration="21000" />
       <workItem from="1787113214298" duration="3043000" />
+      <workItem from="1787211862072" duration="4949000" />
     </task>
     <task id="LOCAL-00001" summary="修改定位信息 0323">
       <option name="closed" value="true" />
diff --git a/backend/src/main/java/com/unis/crm/controller/OpportunityController.java b/backend/src/main/java/com/unis/crm/controller/OpportunityController.java
index ef4e64bc..6525625c 100644
--- a/backend/src/main/java/com/unis/crm/controller/OpportunityController.java
+++ b/backend/src/main/java/com/unis/crm/controller/OpportunityController.java
@@ -45,8 +45,10 @@ public class OpportunityController {
             @RequestParam(value = "stage", required = false) String stage,
             @RequestParam(value = "includeDetails", defaultValue = "true") boolean includeDetails,
             @RequestParam(value = "limit", required = false) Integer limit,
-            @RequestParam(value = "archived", required = false) Boolean archived) {
-        return ApiResponse.success(opportunityService.getOverview(CurrentUserUtils.requireCurrentUserId(userId), keyword, stage, includeDetails, limit, archived));
+            @RequestParam(value = "archived", required = false) Boolean archived,
+            @RequestParam(value = "excludeStageCodes", required = false) List<String> excludeStageCodes,
+            @RequestParam(value = "stageCodes", required = false) List<String> stageCodes) {
+        return ApiResponse.success(opportunityService.getOverview(CurrentUserUtils.requireCurrentUserId(userId), keyword, stage, includeDetails, limit, archived, excludeStageCodes, stageCodes));
     }
 
     @GetMapping("/{opportunityId}")
diff --git a/backend/src/main/java/com/unis/crm/mapper/OpportunityMapper.java b/backend/src/main/java/com/unis/crm/mapper/OpportunityMapper.java
index e82f1930..235635e3 100644
--- a/backend/src/main/java/com/unis/crm/mapper/OpportunityMapper.java
+++ b/backend/src/main/java/com/unis/crm/mapper/OpportunityMapper.java
@@ -45,7 +45,9 @@ public interface OpportunityMapper {
             @Param("preSalesUserId") Long preSalesUserId,
             @Param("preSalesUserNames") List<String> preSalesUserNames,
             @Param("limit") Integer limit,
-            @Param("archived") Boolean archived);
+            @Param("archived") Boolean archived,
+            @Param("excludeStageCodes") List<String> excludeStageCodes,
+            @Param("stageCodes") List<String> stageCodes);
 
     OpportunityItemDTO selectOpportunityDetail(
             @Param("userId") Long userId,
diff --git a/backend/src/main/java/com/unis/crm/service/OpportunityService.java b/backend/src/main/java/com/unis/crm/service/OpportunityService.java
index f44d4ee7..abdc8127 100644
--- a/backend/src/main/java/com/unis/crm/service/OpportunityService.java
+++ b/backend/src/main/java/com/unis/crm/service/OpportunityService.java
@@ -22,6 +22,8 @@ public interface OpportunityService {
 
     OpportunityOverviewDTO getOverview(Long userId, String keyword, String stage, boolean includeDetails, Integer limit, Boolean archived);
 
+    OpportunityOverviewDTO getOverview(Long userId, String keyword, String stage, boolean includeDetails, Integer limit, Boolean archived, List<String> excludeStageCodes, List<String> stageCodes);
+
     OpportunityItemDTO getDetail(Long userId, Long opportunityId);
 
     List<OmsPreSalesOptionDTO> getOmsPreSalesOptions(Long userId);
diff --git a/backend/src/main/java/com/unis/crm/service/impl/OpportunityServiceImpl.java b/backend/src/main/java/com/unis/crm/service/impl/OpportunityServiceImpl.java
index ac93579e..251bd471 100644
--- a/backend/src/main/java/com/unis/crm/service/impl/OpportunityServiceImpl.java
+++ b/backend/src/main/java/com/unis/crm/service/impl/OpportunityServiceImpl.java
@@ -143,6 +143,11 @@ public class OpportunityServiceImpl implements OpportunityService {
 
     @Override
     public OpportunityOverviewDTO getOverview(Long userId, String keyword, String stage, boolean includeDetails, Integer limit, Boolean archived) {
+        return getOverview(userId, keyword, stage, includeDetails, limit, archived, null, null);
+    }
+
+    @Override
+    public OpportunityOverviewDTO getOverview(Long userId, String keyword, String stage, boolean includeDetails, Integer limit, Boolean archived, List<String> excludeStageCodes, List<String> stageCodes) {
         String normalizedKeyword = normalizeKeyword(keyword);
         String normalizedStage = normalizeStage(stage);
         OpportunityVisibility visibility = resolveOpportunityVisibility(userId);
@@ -156,7 +161,9 @@ public class OpportunityServiceImpl implements OpportunityService {
                 visibility.preSalesUserId(),
                 visibility.preSalesUserNames(),
                 limit != null && limit > 0 ? Math.min(limit, 1000) : null,
-                archived);
+                archived,
+                excludeStageCodes,
+                stageCodes);
         if (includeDetails) {
             attachFollowUps(userId, items, visibility);
         }
diff --git a/backend/src/main/resources/mapper/opportunity/OpportunityMapper.xml b/backend/src/main/resources/mapper/opportunity/OpportunityMapper.xml
index a0507a82..a79b66db 100644
--- a/backend/src/main/resources/mapper/opportunity/OpportunityMapper.xml
+++ b/backend/src/main/resources/mapper/opportunity/OpportunityMapper.xml
@@ -261,6 +261,13 @@
         <if test="archived != null">
             and coalesce(o.archived, false) = #{archived}
         </if>
+        <if test="excludeStageCodes != null and excludeStageCodes.size() > 0">
+            and coalesce(o.stage, '') not in (
+                <foreach item="code" collection="excludeStageCodes" open="(" separator="," close=")">
+                    #{code}
+                </foreach>
+            )
+        </if>
         <if test="keyword != null and keyword != ''">
           and (
             o.opportunity_name ilike concat('%', #{keyword}, '%')
@@ -277,6 +284,13 @@
         <if test="stage != null and stage != ''">
           and o.stage = #{stage}
         </if>
+        <if test="stageCodes != null and stageCodes.size() > 0">
+          and o.stage in (
+            <foreach item="code" collection="stageCodes" open="(" separator="," close=")">
+              #{code}
+            </foreach>
+          )
+        </if>
         <include refid="opportunityVisibilityCondition"/>
         order by coalesce(o.updated_at, o.created_at) desc, o.id desc
         <if test="limit != null and limit > 0">
diff --git a/backend/src/test/java/com/unis/crm/service/impl/OpportunityServiceImplTest.java b/backend/src/test/java/com/unis/crm/service/impl/OpportunityServiceImplTest.java
index 9f6b7155..6000b78c 100644
--- a/backend/src/test/java/com/unis/crm/service/impl/OpportunityServiceImplTest.java
+++ b/backend/src/test/java/com/unis/crm/service/impl/OpportunityServiceImplTest.java
@@ -260,6 +260,8 @@ class OpportunityServiceImplTest {
                 eq(9L),
                 eq(List.of("张售前", "presales.zhang")),
                 eq(null),
+                eq(null),
+                eq(null),
                 eq(null))).thenReturn(List.of(item));
         when(opportunityMapper.selectOpportunityFollowUps(
                 eq(9L),
diff --git a/frontend/src/lib/auth.ts b/frontend/src/lib/auth.ts
index 17d63bc6..d3f3de9b 100644
--- a/frontend/src/lib/auth.ts
+++ b/frontend/src/lib/auth.ts
@@ -1620,7 +1620,7 @@ export async function saveWorkDailyReport(payload: CreateWorkDailyReportPayload)
   }, true);
 }
 
-export async function getOpportunityOverview(keyword?: string, stage?: string, includeDetails = true, limit?: number, archived?: boolean) {
+export async function getOpportunityOverview(keyword?: string, stage?: string, includeDetails = true, limit?: number, archived?: boolean, excludeStageCodes?: string[], stageCodes?: string[]) {
   const params = new URLSearchParams();
   if (keyword && keyword.trim()) {
     params.set("keyword", keyword.trim());
@@ -1629,12 +1629,18 @@ export async function getOpportunityOverview(keyword?: string, stage?: string, i
     params.set("stage", stage.trim());
   }
   params.set("includeDetails", String(includeDetails));
-  if (limit !== undefined) {
+  if (limit != null) {
     params.set("limit", String(limit));
   }
   if (archived !== undefined) {
     params.set("archived", String(archived));
   }
+  if (excludeStageCodes && excludeStageCodes.length > 0) {
+    excludeStageCodes.forEach((code) => params.append("excludeStageCodes", code));
+  }
+  if (stageCodes && stageCodes.length > 0) {
+    stageCodes.forEach((code) => params.append("stageCodes", code));
+  }
   const query = params.toString();
   return request<OpportunityOverview>(`/api/opportunities/overview${query ? `?${query}` : ""}`, undefined, true);
 }
@@ -1685,7 +1691,7 @@ export async function getExpansionOverview(keyword?: string, includeDetails = tr
     params.set("keyword", keyword.trim());
   }
   params.set("includeDetails", String(includeDetails));
-  if (limit !== undefined) {
+  if (limit != null) {
     params.set("limit", String(limit));
   }
   const query = params.toString();
@@ -1697,7 +1703,7 @@ export async function getOpportunityExpansionOptions(params?: { keyword?: string
   if (params?.keyword && params.keyword.trim()) {
     searchParams.set("keyword", params.keyword.trim());
   }
-  if (params?.limit !== undefined) {
+  if (params?.limit != null) {
     searchParams.set("limit", String(params.limit));
   }
   const query = searchParams.toString();
diff --git a/frontend/src/pages/Opportunities.tsx b/frontend/src/pages/Opportunities.tsx
index 4c9cde4c..224856c7 100644
--- a/frontend/src/pages/Opportunities.tsx
+++ b/frontend/src/pages/Opportunities.tsx
@@ -87,7 +87,7 @@ const COMPETITOR_OPTIONS = [
 
 type CompetitorOption = (typeof COMPETITOR_OPTIONS)[number];
 type OperatorMode = "none" | "h3c" | "channel" | "both";
-type OpportunityArchiveTab = "active" | "archived";
+type OpportunityArchiveTab = "active" | "archived" | "lost";
 type OpportunityLocationState = { selectedId?: CrmId; archiveTab?: OpportunityArchiveTab } | null;
 type OpportunityExportFilters = {
   keyword?: string;
@@ -444,19 +444,45 @@ function getOpportunityDictOptionLabel(option?: OpportunityDictOption) {
   return option?.label?.trim() || option?.value?.trim() || "";
 }
 
-function isLostOpportunityStageOption(option?: OpportunityDictOption) {
-  const value = getOpportunityDictOptionValue(option).toLowerCase();
-  const label = getOpportunityDictOptionLabel(option).toLowerCase();
+function isLostOpportunityStageOption(option?: { value?: string; label?: string; stageCode?: string; stage?: string }) {
+  const value = (option?.value?.trim() || option?.label?.trim() || option?.stageCode?.trim() || option?.stage?.trim() || "").toLowerCase();
+  const label = (option?.label?.trim() || option?.value?.trim() || option?.stage?.trim() || option?.stageCode?.trim() || "").toLowerCase();
   return value === "lost" || value.includes("丢单") || label.includes("丢单") || value.includes("放弃") || label.includes("放弃");
 }
 
-function getDefaultOpportunityExportStageCodes(options: OpportunityDictOption[]) {
+function getLostStageCodes(stageOptions: OpportunityDictOption[]) {
+  return stageOptions
+    .filter(isLostOpportunityStageOption)
+    .map((opt) => getOpportunityDictOptionValue(opt))
+    .filter(Boolean);
+}
+
+function getDefaultOpportunityExportStageCodes(options: OpportunityDictOption[], archiveTab?: OpportunityArchiveTab) {
   const orderedValues = options.map(getOpportunityDictOptionValue).filter(Boolean);
+  if (archiveTab === "lost") {
+    const lostValues = options.filter(isLostOpportunityStageOption).map(getOpportunityDictOptionValue).filter(Boolean);
+    return normalizeOpportunityMultiSelectValues(lostValues.length > 0 ? lostValues : orderedValues);
+  }
   const preferredValues = options.filter((option) => !isLostOpportunityStageOption(option)).map(getOpportunityDictOptionValue).filter(Boolean);
   return normalizeOpportunityMultiSelectValues(preferredValues.length > 0 ? preferredValues : orderedValues);
 }
 
-function applyDefaultOpportunityExportStageFilters(filters: OpportunityExportFilters, stageOptions: OpportunityDictOption[]) {
+function applyDefaultOpportunityExportStageFilters(filters: OpportunityExportFilters, stageOptions: OpportunityDictOption[], archiveTab?: OpportunityArchiveTab) {
+  if (archiveTab === "lost") {
+    if (filters.stageCodes === undefined) {
+      const lostValues = stageOptions.filter(isLostOpportunityStageOption).map(getOpportunityDictOptionValue).filter(Boolean);
+      return {
+        ...filters,
+        stage: undefined,
+        stageCodes: normalizeOpportunityMultiSelectValues(lostValues),
+      };
+    }
+    return {
+      ...filters,
+      stage: undefined,
+      stageCodes: normalizeOpportunityMultiSelectValues(filters.stageCodes),
+    };
+  }
   if (filters.stageCodes !== undefined) {
     return {
       ...filters,
@@ -481,7 +507,7 @@ function applyDefaultOpportunityExportStageFilters(filters: OpportunityExportFil
   return {
     ...filters,
     stage: undefined,
-    stageCodes: getDefaultOpportunityExportStageCodes(stageOptions),
+    stageCodes: getDefaultOpportunityExportStageCodes(stageOptions, archiveTab),
   };
 }
 
@@ -970,11 +996,12 @@ function OpportunityExportFilterModal({
   onClose: () => void;
   onConfirm: (filters: OpportunityExportFilters) => void;
 }) {
-  const normalizedInitialFilters = applyDefaultOpportunityExportStageFilters(initialFilters, stageOptions);
+  const normalizedInitialFilters = applyDefaultOpportunityExportStageFilters(initialFilters, stageOptions, archiveTab);
   const [draftFilters, setDraftFilters] = useState<OpportunityExportFilters>(normalizedInitialFilters);
   const selectedFields = resolveSelectedOpportunityFields(draftFilters.selectedFields);
-  const defaultStageCodes = getDefaultOpportunityExportStageCodes(stageOptions);
+  const defaultStageCodes = getDefaultOpportunityExportStageCodes(stageOptions, archiveTab);
   const exportStageOptions = stageOptions
+    .filter((option) => archiveTab === "lost" || archiveTab === "archived" || !isLostOpportunityStageOption(option))
     .map((option) => {
       const value = getOpportunityDictOptionValue(option);
       const label = getOpportunityDictOptionLabel(option);
@@ -984,7 +1011,7 @@ function OpportunityExportFilterModal({
   const selectedStageCodes = normalizeOpportunityMultiSelectValues(draftFilters.stageCodes);
 
   useEffect(() => {
-    setDraftFilters(applyDefaultOpportunityExportStageFilters(initialFilters, stageOptions));
+    setDraftFilters(applyDefaultOpportunityExportStageFilters(initialFilters, stageOptions, archiveTab));
   }, [initialFilters, stageOptions]);
 
   const hasDraftFilters = Boolean(
@@ -997,7 +1024,7 @@ function OpportunityExportFilterModal({
       || draftFilters.operatorName
       || draftFilters.hasSalesExpansion
       || draftFilters.hasChannelExpansion,
-  ) || !areSameOpportunityStringSets(selectedStageCodes, defaultStageCodes)
+  ) || (archiveTab !== "lost" && !areSameOpportunityStringSets(selectedStageCodes, defaultStageCodes))
     || JSON.stringify(selectedFields) !== JSON.stringify(defaultOpportunityExportFields);
   const hasSelectedFields = selectedFields.length > 0;
   const handleFilterChange = (key: keyof OpportunityExportFilters, value: string) => {
@@ -1044,15 +1071,15 @@ function OpportunityExportFilterModal({
 
   return (
     <ModalShell
-      title={`导出${archiveTab === "active" ? "未签单" : "已签单"}商机`}
-      subtitle="选择条件后导出 Excel；不填条件则导出当前签单页签下的全部可见商机。"
+      title={`导出${archiveTab === "active" ? "未签单" : archiveTab === "lost" ? "已丢单" : "已签单"}商机`}
+      subtitle="选择条件后导出 Excel；不填条件则导出当前页签下的全部可见商机。"
       onClose={onClose}
       footer={(
         <div className="flex flex-col-reverse gap-3 sm:flex-row sm:justify-between">
           <button
             type="button"
             onClick={() => setDraftFilters((current) => ({
-              ...applyDefaultOpportunityExportStageFilters({}, stageOptions),
+              ...applyDefaultOpportunityExportStageFilters({}, stageOptions, archiveTab),
               selectedFields: resolveSelectedOpportunityFields(current.selectedFields),
             }))}
             disabled={!hasDraftFilters}
@@ -1099,6 +1126,7 @@ function OpportunityExportFilterModal({
             className="crm-input-box crm-input-text w-full border border-slate-200 bg-white outline-none focus:border-violet-500 focus:ring-1 focus:ring-violet-500 dark:border-slate-800 dark:bg-slate-900/50"
           />
         </label>
+        {archiveTab !== "lost" ? (
         <div className="space-y-3 rounded-2xl border border-slate-200 bg-slate-50 p-4 dark:border-slate-800 dark:bg-slate-900/40 sm:col-span-2">
           <div className="flex flex-col gap-2 sm:flex-row sm:items-center sm:justify-between">
             <div>
@@ -1157,6 +1185,7 @@ function OpportunityExportFilterModal({
             <p className="text-xs text-slate-500 dark:text-slate-400">未加载到阶段字典，导出时不会按项目阶段过滤。</p>
           )}
         </div>
+        ) : null}
         <label className="space-y-1.5">
           <span className="text-sm font-medium text-slate-700 dark:text-slate-300">项目把握度</span>
           <AdaptiveSelect
@@ -1991,7 +2020,12 @@ export default function Opportunities() {
 
     async function load() {
       try {
-        const data = await getOpportunityOverview(keyword, filter, false, LIST_PAGE_SIZE + 1, archiveTab === "archived");
+        const lostStageCodes = getLostStageCodes(stageOptions);
+        const effectiveStageCodes = archiveTab === "lost" ? lostStageCodes : undefined;
+        const effectiveStage = archiveTab === "lost" ? undefined : filter;
+        const effectiveArchived = archiveTab === "archived";
+        const effectiveExcludeStageCodes = archiveTab === "active" ? lostStageCodes : undefined;
+        const data = await getOpportunityOverview(keyword, effectiveStage, false, LIST_PAGE_SIZE + 1, effectiveArchived, effectiveExcludeStageCodes, effectiveStageCodes);
         if (!cancelled) {
           setItems(data.items ?? []);
           setSelectedItem(null);
@@ -2008,16 +2042,20 @@ export default function Opportunities() {
     return () => {
       cancelled = true;
     };
-  }, [keyword, filter, archiveTab]);
+  }, [keyword, filter, archiveTab, stageOptions]);
 
   useEffect(() => {
     setVisibleItemCount(LIST_PAGE_SIZE);
-  }, [keyword, filter, archiveTab]);
+    const lostCodes = getLostStageCodes(stageOptions);
+    if (archiveTab === "active" && lostCodes.includes(filter)) {
+      setFilter("全部");
+    }
+  }, [keyword, filter, archiveTab, stageOptions]);
 
   useEffect(() => {
     const requestedState = location.state as OpportunityLocationState;
     const requestedArchiveTab = requestedState?.archiveTab;
-    if (requestedArchiveTab === "active" || requestedArchiveTab === "archived") {
+    if (requestedArchiveTab === "active" || requestedArchiveTab === "archived" || requestedArchiveTab === "lost") {
       setArchiveTab(requestedArchiveTab);
     }
   }, [location.state]);
@@ -2219,10 +2257,14 @@ export default function Opportunities() {
     }
     setExportFilters((current) => (
       current.stageCodes === undefined
-        ? applyDefaultOpportunityExportStageFilters(current, stageOptions)
+        ? applyDefaultOpportunityExportStageFilters(current, stageOptions, archiveTab)
         : current
     ));
-  }, [stageOptions]);
+  }, [stageOptions, archiveTab]);
+
+  useEffect(() => {
+    setExportFilters((current) => ({ ...current, stageCodes: undefined }));
+  }, [archiveTab]);
 
   useEffect(() => {
     if (!opportunityTypeOptions.length) {
@@ -2319,7 +2361,10 @@ export default function Opportunities() {
 
   const detailItem = selectedItem ? (selectedItemDetail ?? selectedItem) : null;
   const followUpRecords: OpportunityFollowUp[] = detailItem?.followUps ?? [];
-  const filteredItems = items.filter((item) => (archiveTab === "active" ? !item.archived : Boolean(item.archived)));
+  const filteredItems = items.filter((item) => {
+    if (archiveTab === "lost") return !item.archived && isLostOpportunityStageOption(item);
+    return archiveTab === "active" ? !item.archived && !isLostOpportunityStageOption(item) : Boolean(item.archived);
+  });
   const visibleItems = filteredItems.slice(0, visibleItemCount);
   const hasMoreItems = visibleItems.length < filteredItems.length;
 
@@ -2330,7 +2375,12 @@ export default function Opportunities() {
     loadingMoreRef.current = true;
     const nextVisibleCount = visibleItemCount + LIST_PAGE_SIZE;
     try {
-      const data = await getOpportunityOverview(keyword, filter, false, nextVisibleCount + 1, archiveTab === "archived");
+      const lostStageCodes = getLostStageCodes(stageOptions);
+      const effectiveStageCodes = archiveTab === "lost" ? lostStageCodes : undefined;
+      const effectiveStage = archiveTab === "lost" ? undefined : filter;
+      const effectiveArchived = archiveTab === "archived";
+      const effectiveExcludeStageCodes = archiveTab === "active" ? lostStageCodes : undefined;
+      const data = await getOpportunityOverview(keyword, effectiveStage, false, nextVisibleCount + 1, effectiveArchived, effectiveExcludeStageCodes, effectiveStageCodes);
       setItems(data.items ?? []);
       setVisibleItemCount(nextVisibleCount);
     } finally {
@@ -2355,7 +2405,9 @@ export default function Opportunities() {
   }, [hasMoreItems, visibleItemCount, filteredItems.length, keyword, filter, archiveTab]);
   const stageFilterOptions = [
     { label: "全部", value: "全部" },
-    ...stageOptions.map((item) => ({ label: item.label || item.value || "", value: item.value || "" })),
+    ...stageOptions
+      .filter((item) => archiveTab === "lost" || archiveTab === "archived" || !isLostOpportunityStageOption(item))
+      .map((item) => ({ label: item.label || item.value || "", value: item.value || "" })),
   ].filter((item) => item.value);
   const normalizedProjectLocation = form.projectLocation?.trim() || "";
   const normalizedProjectOwnershipLocation = form.projectOwnershipLocation?.trim() || "";
@@ -2515,20 +2567,28 @@ export default function Opportunities() {
       return;
     }
 
-    const normalizedFilters = applyDefaultOpportunityExportStageFilters(filters, stageOptions);
+    const normalizedFilters = applyDefaultOpportunityExportStageFilters(filters, stageOptions, archiveTab);
     setExporting(true);
     setExportError("");
     setExportFilters(normalizedFilters);
     persistOpportunityExportPreferences(normalizedFilters);
 
     try {
-      const overview = await getOpportunityOverview("", "全部");
+      const lostStageCodes = getLostStageCodes(stageOptions);
+      const exportStageCodes = archiveTab === "lost" ? lostStageCodes : undefined;
+      const exportArchived = archiveTab === "archived";
+      const exportExcludeStageCodes = archiveTab === "active" ? lostStageCodes : undefined;
+      const overview = await getOpportunityOverview("", undefined, false, null, exportArchived, exportExcludeStageCodes, exportStageCodes);
       const exportItems = (overview.items ?? [])
-        .filter((item) => (archiveTab === "active" ? !item.archived : Boolean(item.archived)))
+        .filter((item) => {
+          if (archiveTab === "lost") return !item.archived && isLostOpportunityStageOption(item);
+          return archiveTab === "active" ? !item.archived && !isLostOpportunityStageOption(item) : Boolean(item.archived);
+        })
         .filter((item) => matchesOpportunityExportFilters(item, normalizedFilters, effectiveConfidenceOptions));
       const selectedFieldKeys = resolveSelectedOpportunityFields(normalizedFilters.selectedFields);
+      const exportTabLabel = archiveTab === "active" ? "未签单" : archiveTab === "lost" ? "已丢单" : "已签单";
       if (exportItems.length <= 0) {
-        throw new Error(`当前筛选条件下暂无可导出的${archiveTab === "active" ? "未签单" : "已签单"}商机`);
+        throw new Error(`当前筛选条件下暂无可导出的${exportTabLabel}商机`);
       }
       if (selectedFieldKeys.length <= 0) {
         throw new Error("请至少选择一个导出字段");
@@ -2615,7 +2675,7 @@ export default function Opportunities() {
       });
 
       const buffer = await workbook.xlsx.writeBuffer();
-      const filename = `商机储备_${archiveTab === "active" ? "未签单" : "已签单"}_${formatOpportunityExportFilenameTime()}.xlsx`;
+      const filename = `商机储备_${exportTabLabel}_${formatOpportunityExportFilenameTime()}.xlsx`;
       downloadOpportunityExcelFile(filename, buffer);
       setExportFilterOpen(false);
     } catch (exportErr) {
@@ -2839,7 +2899,12 @@ export default function Opportunities() {
   };
 
   const reload = async (preferredSelectedId?: CrmId) => {
-    const data = await getOpportunityOverview(keyword, filter, false);
+    const lostStageCodes = getLostStageCodes(stageOptions);
+    const effectiveStageCodes = archiveTab === "lost" ? lostStageCodes : undefined;
+    const effectiveStage = archiveTab === "lost" ? undefined : filter;
+    const effectiveArchived = archiveTab === "archived";
+    const effectiveExcludeStageCodes = archiveTab === "active" ? lostStageCodes : undefined;
+    const data = await getOpportunityOverview(keyword, effectiveStage, false, LIST_PAGE_SIZE + 1, effectiveArchived, effectiveExcludeStageCodes, effectiveStageCodes);
     const nextItems = data.items ?? [];
     setItems(nextItems);
     if (preferredSelectedId) {
@@ -3046,7 +3111,7 @@ export default function Opportunities() {
 
   const renderEmpty = () => (
     <div className="crm-empty-panel">
-      {archiveTab === "active" ? "暂无未签单商机，先新增一条试试。" : "暂无已签单商机。"}
+      {archiveTab === "active" ? "暂无未签单商机，先新增一条试试。" : archiveTab === "lost" ? "暂无已丢单商机。" : "暂无已签单商机。"}
     </div>
   );
 
@@ -3107,6 +3172,19 @@ export default function Opportunities() {
         >
           已签单
         </button>
+        <button
+          onClick={() => {
+            setArchiveTab("lost");
+            setExportError("");
+          }}
+          className={`flex-1 rounded-lg py-2 text-sm font-medium transition-colors duration-200 ${
+            archiveTab === "lost"
+              ? "bg-white text-violet-600 shadow-sm dark:bg-slate-800 dark:text-violet-400"
+              : "text-slate-600 hover:text-slate-900 dark:text-slate-400 dark:hover:text-white"
+          }`}
+        >
+          已丢单
+        </button>
       </div>
 
       <div className="flex items-center gap-3">
@@ -3123,6 +3201,7 @@ export default function Opportunities() {
             className="crm-input-text w-full rounded-xl border border-slate-200 bg-white py-2.5 pl-10 pr-4 text-slate-900 outline-none transition-all focus:border-violet-500 focus:ring-1 focus:ring-violet-500 dark:border-slate-800 dark:bg-slate-900/50 dark:text-white"
           />
         </div>
+        {archiveTab !== "lost" ? (
         <button
           type="button"
           onClick={() => setStageFilterOpen(true)}
@@ -3137,6 +3216,7 @@ export default function Opportunities() {
           <ListFilter className="h-5 w-5" />
           {filter !== "全部" ? <span className="absolute right-2 top-2 h-2 w-2 rounded-full bg-violet-500" /> : null}
         </button>
+        ) : null}
       </div>
 
       {exportError ? <div className="crm-alert crm-alert-error">{exportError}</div> : null}
@@ -3238,7 +3318,7 @@ export default function Opportunities() {
       <AnimatePresence>
         {exportFilterOpen ? (
           <OpportunityExportFilterModal
-            initialFilters={applyDefaultOpportunityExportStageFilters(exportFilters, stageOptions)}
+            initialFilters={applyDefaultOpportunityExportStageFilters(exportFilters, stageOptions, archiveTab)}
             exporting={exporting}
             exportError={exportError}
             archiveTab={archiveTab}