diff --git a/.DS_Store b/.DS_Store
index d8f9254..55b6e62 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/app.zip b/app.zip
index 4bb133b..477099a 100644
Binary files a/app.zip and b/app.zip differ
diff --git a/app/api/endpoints/meetings.py b/app/api/endpoints/meetings.py
index 68f2e43..aa350ab 100644
--- a/app/api/endpoints/meetings.py
+++ b/app/api/endpoints/meetings.py
@@ -232,7 +232,8 @@ def get_meeting_details(meeting_id: int, current_user: dict = Depends(get_curren
         cursor = connection.cursor(dictionary=True)
         query = '''
             SELECT m.meeting_id, m.title, m.meeting_time, m.summary, m.created_at, m.tags,
-                   m.user_id as creator_id, u.caption as creator_username, af.file_path as audio_file_path
+                   m.user_id as creator_id, u.caption as creator_username, af.file_path as audio_file_path,
+                   m.access_password
             FROM meetings m JOIN users u ON m.user_id = u.user_id LEFT JOIN audio_files af ON m.meeting_id = af.meeting_id
             WHERE m.meeting_id = %s
         '''
@@ -249,7 +250,8 @@ def get_meeting_details(meeting_id: int, current_user: dict = Depends(get_curren
         meeting_data = Meeting(
             meeting_id=meeting['meeting_id'], title=meeting['title'], meeting_time=meeting['meeting_time'],
             summary=meeting['summary'], created_at=meeting['created_at'], attendees=attendees,
-            creator_id=meeting['creator_id'], creator_username=meeting['creator_username'], tags=tags
+            creator_id=meeting['creator_id'], creator_username=meeting['creator_username'], tags=tags,
+            access_password=meeting.get('access_password')
         )
         if meeting['audio_file_path']:
             meeting_data.audio_file_path = meeting['audio_file_path']
@@ -341,7 +343,8 @@ def get_meeting_for_edit(meeting_id: int, current_user: dict = Depends(get_curre
         cursor = connection.cursor(dictionary=True)
         query = '''
             SELECT m.meeting_id, m.title, m.meeting_time, m.summary, m.created_at, m.tags,
-                   m.user_id as creator_id, u.caption as creator_username, af.file_path as audio_file_path
+                   m.user_id as creator_id, u.caption as creator_username, af.file_path as audio_file_path,
+                   m.access_password
             FROM meetings m JOIN users u ON m.user_id = u.user_id LEFT JOIN audio_files af ON m.meeting_id = af.meeting_id
             WHERE m.meeting_id = %s
         '''
@@ -358,7 +361,8 @@ def get_meeting_for_edit(meeting_id: int, current_user: dict = Depends(get_curre
         meeting_data = Meeting(
             meeting_id=meeting['meeting_id'], title=meeting['title'], meeting_time=meeting['meeting_time'],
             summary=meeting['summary'], created_at=meeting['created_at'], attendees=attendees,
-            creator_id=meeting['creator_id'], creator_username=meeting['creator_username'], tags=tags
+            creator_id=meeting['creator_id'], creator_username=meeting['creator_username'], tags=tags,
+            access_password=meeting.get('access_password')
         )
         if meeting.get('audio_file_path'):
             meeting_data.audio_file_path = meeting['audio_file_path']
@@ -888,7 +892,7 @@ def get_meeting_preview_data(meeting_id: int):
             query = '''
                 SELECT m.meeting_id, m.title, m.meeting_time, m.summary, m.updated_at, m.prompt_id,
                        m.user_id as creator_id, u.caption as creator_username,
-                       p.name as prompt_name
+                       p.name as prompt_name, m.access_password
                 FROM meetings m
                 JOIN users u ON m.user_id = u.user_id
                 LEFT JOIN prompts p ON m.prompt_id = p.id
@@ -920,10 +924,136 @@ def get_meeting_preview_data(meeting_id: int):
                 "prompt_id": meeting['prompt_id'],
                 "prompt_name": meeting['prompt_name'],
                 "attendees": attendees,
-                "attendees_count": len(attendees)
+                "attendees_count": len(attendees),
+                "has_password": bool(meeting.get('access_password'))  # 新增：是否设置了访问密码
             }
 
             return create_api_response(code="200", message="获取会议预览数据成功", data=preview_data)
 
     except Exception as e:
         return create_api_response(code="500", message=f"Failed to get meeting preview data: {str(e)}")
+
+# 访问密码管理相关API
+
+class AccessPasswordRequest(BaseModel):
+    password: Optional[str] = None  # None表示关闭密码
+
+class VerifyPasswordRequest(BaseModel):
+    password: str
+
+@router.put("/meetings/{meeting_id}/access-password")
+def update_meeting_access_password(
+    meeting_id: int,
+    request: AccessPasswordRequest,
+    current_user: dict = Depends(get_current_user)
+):
+    """
+    设置或关闭会议访问密码（仅创建人可操作）
+
+    Args:
+        meeting_id: 会议ID
+        request.password: 密码字符串（None表示关闭密码）
+        current_user: 当前登录用户
+
+    Returns:
+        API响应，包含操作结果
+    """
+    try:
+        with get_db_connection() as connection:
+            cursor = connection.cursor(dictionary=True)
+
+            # 检查会议是否存在且当前用户是创建人
+            cursor.execute(
+                "SELECT meeting_id, user_id FROM meetings WHERE meeting_id = %s",
+                (meeting_id,)
+            )
+            meeting = cursor.fetchone()
+
+            if not meeting:
+                return create_api_response(code="404", message="会议不存在")
+
+            if meeting['user_id'] != current_user['user_id']:
+                return create_api_response(code="403", message="仅创建人可以设置访问密码")
+
+            # 更新访问密码
+            cursor.execute(
+                "UPDATE meetings SET access_password = %s WHERE meeting_id = %s",
+                (request.password, meeting_id)
+            )
+            connection.commit()
+
+            if request.password:
+                return create_api_response(
+                    code="200",
+                    message="访问密码已设置",
+                    data={"password": request.password}
+                )
+            else:
+                return create_api_response(
+                    code="200",
+                    message="访问密码已关闭",
+                    data={"password": None}
+                )
+
+    except Exception as e:
+        return create_api_response(
+            code="500",
+            message=f"设置访问密码失败: {str(e)}"
+        )
+
+@router.post("/meetings/{meeting_id}/verify-password")
+def verify_meeting_password(meeting_id: int, request: VerifyPasswordRequest):
+    """
+    验证会议访问密码（无需登录认证）
+
+    Args:
+        meeting_id: 会议ID
+        request.password: 要验证的密码
+
+    Returns:
+        API响应，包含验证结果
+    """
+    try:
+        with get_db_connection() as connection:
+            cursor = connection.cursor(dictionary=True)
+
+            # 获取会议的访问密码
+            cursor.execute(
+                "SELECT access_password FROM meetings WHERE meeting_id = %s",
+                (meeting_id,)
+            )
+            meeting = cursor.fetchone()
+
+            if not meeting:
+                return create_api_response(code="404", message="会议不存在")
+
+            # 验证密码
+            stored_password = meeting.get('access_password')
+
+            if not stored_password:
+                # 没有设置密码，直接通过
+                return create_api_response(
+                    code="200",
+                    message="该会议未设置访问密码",
+                    data={"verified": True}
+                )
+
+            if request.password == stored_password:
+                return create_api_response(
+                    code="200",
+                    message="密码验证成功",
+                    data={"verified": True}
+                )
+            else:
+                return create_api_response(
+                    code="200",
+                    message="密码错误",
+                    data={"verified": False}
+                )
+
+    except Exception as e:
+        return create_api_response(
+            code="500",
+            message=f"验证密码失败: {str(e)}"
+        )
+
diff --git a/app/api/endpoints/prompts.py b/app/api/endpoints/prompts.py
index 0244d6f..bda1a14 100644
--- a/app/api/endpoints/prompts.py
+++ b/app/api/endpoints/prompts.py
@@ -203,6 +203,37 @@ def delete_prompt(prompt_id: int, current_user: dict = Depends(get_current_user)
         if prompt['creator_id'] != current_user["user_id"]:
             return create_api_response(code="403", message="无权删除其他用户的提示词")
 
+        # 检查是否有会议引用了该提示词
+        cursor.execute(
+            "SELECT COUNT(*) as count FROM meetings WHERE prompt_id = %s",
+            (prompt_id,)
+        )
+        meeting_count = cursor.fetchone()['count']
+
+        # 检查是否有知识库引用了该提示词
+        cursor.execute(
+            "SELECT COUNT(*) as count FROM knowledge_bases WHERE prompt_id = %s",
+            (prompt_id,)
+        )
+        kb_count = cursor.fetchone()['count']
+
+        # 如果有引用，不允许删除
+        if meeting_count > 0 or kb_count > 0:
+            references = []
+            if meeting_count > 0:
+                references.append(f"{meeting_count}个会议")
+            if kb_count > 0:
+                references.append(f"{kb_count}个知识库")
+
+            return create_api_response(
+                code="400",
+                message=f"无法删除：该提示词被{' 和 '.join(references)}引用",
+                data={
+                    "meeting_count": meeting_count,
+                    "kb_count": kb_count
+                }
+            )
+
         # 删除提示词
         cursor.execute("DELETE FROM prompts WHERE id = %s", (prompt_id,))
         connection.commit()
diff --git a/app/models/models.py b/app/models/models.py
index 98d6c35..5cd9894 100644
--- a/app/models/models.py
+++ b/app/models/models.py
@@ -77,6 +77,7 @@ class Meeting(BaseModel):
     audio_file_path: Optional[str] = None
     transcription_status: Optional[TranscriptionTaskStatus] = None
     tags: Optional[List[Tag]] = []
+    access_password: Optional[str] = None
 
 class TranscriptSegment(BaseModel):
     segment_id: int
diff --git a/requirements-prod.txt b/requirements-prod.txt
index 0cbca48..9bd1d4e 100644
--- a/requirements-prod.txt
+++ b/requirements-prod.txt
@@ -14,4 +14,7 @@ qiniu
 
 # Validation & Forms
 email-validator
-python-multipart
\ No newline at end of file
+python-multipart
+
+# System Monitoring
+psutil
diff --git a/requirements.txt b/requirements.txt
index 598fe20..3cdd46f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,4 +8,5 @@ qiniu
 redis>=5.0.0
 dashscope
 PyJWT>=2.8.0
-python-jose[cryptography]>=3.3.0
\ No newline at end of file
+python-jose[cryptography]>=3.3.0
+psutil