diff --git a/.env.example b/.env.example
index aa93881..45fd0ca 100644
--- a/.env.example
+++ b/.env.example
@@ -79,7 +79,7 @@ BAODAN_WORKFLOW_API_KEY=app-your-workflow-api-key
 BAODAN_KB_API_KEY=dataset-your-kb-api-key
 
 # 访客模式
-GUEST_MODE=true
+GUEST_MODE=false
 
 # 插件服务
 PLUGIN_DAEMON_KEY=your_plugin_daemon_key
diff --git a/api/insurance/app.py b/api/insurance/app.py
index 93279e5..98135f4 100644
--- a/api/insurance/app.py
+++ b/api/insurance/app.py
@@ -124,7 +124,7 @@ def create_app() -> Flask:
     app.config['WECOM_WEBHOOK_URL'] = os.getenv('WECOM_WEBHOOK_URL', '')
 
     # 访客模式
-    app.config['GUEST_MODE'] = os.getenv('GUEST_MODE', 'true').lower() == 'true'
+    app.config['GUEST_MODE'] = os.getenv('GUEST_MODE', 'false').lower() == 'true'
 
     # 域名（分享链接用）
     app.config['DOMAIN'] = os.getenv('DOMAIN', 'localhost')
diff --git a/api/insurance/generation/routes.py b/api/insurance/generation/routes.py
index 49cd2dc..dc41ac3 100644
--- a/api/insurance/generation/routes.py
+++ b/api/insurance/generation/routes.py
@@ -5,7 +5,7 @@
 import json
 import logging
 from flask import Blueprint, request
-from insurance.middleware.auth_middleware import jwt_required
+from insurance.middleware.auth_middleware import account_required
 from insurance.utils.response import success, error, ErrorCode
 
 logger = logging.getLogger(__name__)
@@ -16,7 +16,7 @@ workspace_bp = Blueprint("workspace", __name__)
 # ─── PPT 工作区 ────────────────────────────────────────────
 
 @workspace_bp.route("/ppt/workspaces", methods=["GET"])
-@jwt_required
+@account_required
 def list_ppt_workspaces():
     """查询用户 PPT 工作区列表。"""
     from insurance.db.compat import db
@@ -40,7 +40,7 @@ def list_ppt_workspaces():
 
 
 @workspace_bp.route("/ppt/workspaces/<session_id>", methods=["GET"])
-@jwt_required
+@account_required
 def get_ppt_workspace(session_id):
     """获取 PPT 工作区详情。"""
     from insurance.models.ppt_session import PptSession
@@ -53,7 +53,7 @@ def get_ppt_workspace(session_id):
 
 
 @workspace_bp.route("/ppt/workspaces/<session_id>/rename", methods=["PUT"])
-@jwt_required
+@account_required
 def rename_ppt_workspace(session_id):
     """重命名 PPT 工作区。"""
     from insurance.db.compat import db
@@ -75,7 +75,7 @@ def rename_ppt_workspace(session_id):
 
 
 @workspace_bp.route("/ppt/workspaces/<session_id>/draft", methods=["POST", "PATCH"])
-@jwt_required
+@account_required
 def save_ppt_draft(session_id):
     """自动保存 PPT 草稿（乐观锁）。
 
@@ -116,7 +116,7 @@ def save_ppt_draft(session_id):
 
 
 @workspace_bp.route("/ppt/workspaces/<session_id>/archive", methods=["PUT"])
-@jwt_required
+@account_required
 def archive_ppt_workspace(session_id):
     """归档 PPT 工作区。"""
     from datetime import datetime
@@ -134,7 +134,7 @@ def archive_ppt_workspace(session_id):
 
 
 @workspace_bp.route("/ppt/workspaces/<session_id>/unarchive", methods=["PUT"])
-@jwt_required
+@account_required
 def unarchive_ppt_workspace(session_id):
     """取消归档 PPT 工作区。"""
     from insurance.db.compat import db
@@ -151,7 +151,7 @@ def unarchive_ppt_workspace(session_id):
 
 
 @workspace_bp.route("/ppt/workspaces/<session_id>/copy", methods=["POST"])
-@jwt_required
+@account_required
 def copy_ppt_workspace(session_id):
     """复制 PPT 工作区为新任务。"""
     from insurance.db.compat import db
@@ -183,7 +183,7 @@ def copy_ppt_workspace(session_id):
 # ─── 海报工作区 ────────────────────────────────────────────
 
 @workspace_bp.route("/poster/workspaces", methods=["GET"])
-@jwt_required
+@account_required
 def list_poster_workspaces():
     """查询用户海报工作区列表。"""
     from insurance.models.poster_record import PosterRecord
@@ -206,7 +206,7 @@ def list_poster_workspaces():
 
 
 @workspace_bp.route("/poster/workspaces/<int:record_id>", methods=["GET"])
-@jwt_required
+@account_required
 def get_poster_workspace(record_id):
     """获取海报工作区详情。"""
     from insurance.models.poster_record import PosterRecord
@@ -219,7 +219,7 @@ def get_poster_workspace(record_id):
 
 
 @workspace_bp.route("/poster/workspaces/<int:record_id>/rename", methods=["PUT"])
-@jwt_required
+@account_required
 def rename_poster_workspace(record_id):
     """重命名海报工作区。"""
     from insurance.db.compat import db
@@ -241,7 +241,7 @@ def rename_poster_workspace(record_id):
 
 
 @workspace_bp.route("/poster/workspaces/<int:record_id>/draft", methods=["POST", "PATCH"])
-@jwt_required
+@account_required
 def save_poster_draft(record_id):
     """自动保存海报草稿（乐观锁）。"""
     from insurance.db.compat import db
@@ -276,7 +276,7 @@ def save_poster_draft(record_id):
 
 
 @workspace_bp.route("/poster/workspaces/<int:record_id>/archive", methods=["PUT"])
-@jwt_required
+@account_required
 def archive_poster_workspace(record_id):
     """归档海报工作区。"""
     from datetime import datetime
@@ -295,7 +295,7 @@ def archive_poster_workspace(record_id):
 
 
 @workspace_bp.route("/poster/workspaces/<int:record_id>/copy", methods=["POST"])
-@jwt_required
+@account_required
 def copy_poster_workspace(record_id):
     """复制海报工作区为新任务。"""
     from insurance.db.compat import db
@@ -327,7 +327,7 @@ def copy_poster_workspace(record_id):
 # ─── 统一任务接口 ──────────────────────────────────────────
 
 @workspace_bp.route("/tasks", methods=["GET"])
-@jwt_required
+@account_required
 def list_tasks():
     """查询任务列表（任务中心）。"""
     from insurance.generation import task_service
@@ -349,7 +349,7 @@ def list_tasks():
 
 
 @workspace_bp.route("/tasks/active", methods=["GET"])
-@jwt_required
+@account_required
 def list_active_tasks():
     """查询活跃任务（任务坞）。"""
     from insurance.generation import task_service
@@ -362,7 +362,7 @@ def list_active_tasks():
 
 
 @workspace_bp.route("/tasks/<task_id>", methods=["GET"])
-@jwt_required
+@account_required
 def get_task(task_id):
     """获取任务详情。"""
     from insurance.generation import task_service
@@ -375,7 +375,7 @@ def get_task(task_id):
 
 
 @workspace_bp.route("/tasks/<task_id>/cancel", methods=["PUT"])
-@jwt_required
+@account_required
 def cancel_task(task_id):
     """取消排队中的任务。"""
     from insurance.generation import task_service
@@ -388,7 +388,7 @@ def cancel_task(task_id):
 
 
 @workspace_bp.route("/tasks/<task_id>/hide", methods=["PUT"])
-@jwt_required
+@account_required
 def hide_task(task_id):
     """从任务坞隐藏任务。"""
     from insurance.generation import task_service
@@ -401,7 +401,7 @@ def hide_task(task_id):
 
 
 @workspace_bp.route("/tasks/<task_id>/viewed", methods=["PUT"])
-@jwt_required
+@account_required
 def mark_task_viewed(task_id):
     """标记任务为已查看。"""
     from insurance.generation import task_service
@@ -414,7 +414,7 @@ def mark_task_viewed(task_id):
 
 
 @workspace_bp.route("/tasks/<task_id>/download", methods=["GET"])
-@jwt_required
+@account_required
 def download_task_output(task_id):
     """按任务下载成品（确保下载的是该任务的版本，而非工作区最新版本）。"""
     import json as _json
diff --git a/api/insurance/generation/task_service.py b/api/insurance/generation/task_service.py
index e1b960f..35d6909 100644
--- a/api/insurance/generation/task_service.py
+++ b/api/insurance/generation/task_service.py
@@ -21,6 +21,7 @@ def create_task(user_id: str, artifact_type: str, operation: str,
     # 幂等检查
     if idempotency_key:
         existing = GenerationTask.query.filter_by(
+            user_id=user_id,
             idempotency_key=idempotency_key,
         ).filter(GenerationTask.status.in_(["queued", "running", "done"])).first()
         if existing:
@@ -28,6 +29,9 @@ def create_task(user_id: str, artifact_type: str, operation: str,
 
     # 检查同一工作区是否有运行中的任务
     active = GenerationTask.query.filter_by(
+        user_id=user_id,
+        artifact_type=artifact_type,
+        operation=operation,
         workspace_id=workspace_id,
     ).filter(GenerationTask.status.in_(["queued", "running"])).first()
     if active:
@@ -104,7 +108,7 @@ def _sync_failed_ppt_session(task, message: str):
     from insurance.models.ppt_session import PptSession
 
     session = PptSession.query.get(task.workspace_id)
-    if not session or session.status != "parsing":
+    if not session or session.user_id != task.user_id or session.status != "parsing":
         return
     if session.latest_task_id and session.latest_task_id != task.id:
         return
@@ -138,7 +142,7 @@ def _sync_ppt_workspace(task, db):
     from insurance.models.ppt_session import PptSession
 
     session = PptSession.query.get(task.workspace_id)
-    if not session:
+    if not session or session.user_id != task.user_id:
         return
 
     # 安全检查：只同步最新任务
@@ -180,7 +184,7 @@ def _sync_poster_workspace(task, db):
     from insurance.models.poster_record import PosterRecord
 
     record = PosterRecord.query.get(task.workspace_id)
-    if not record:
+    if not record or record.user_id != task.user_id:
         return
 
     # 安全检查
diff --git a/api/insurance/middleware/auth_middleware.py b/api/insurance/middleware/auth_middleware.py
index c2d7d89..d18ae83 100644
--- a/api/insurance/middleware/auth_middleware.py
+++ b/api/insurance/middleware/auth_middleware.py
@@ -93,6 +93,18 @@ def jwt_required(f):
     return decorated
 
 
+def account_required(f):
+    """要求已登录账号，不允许访客身份访问私有业务数据。"""
+    @wraps(f)
+    @jwt_required
+    def decorated(*args, **kwargs):
+        user_id = str(getattr(request, "user_id", ""))
+        if not user_id or user_id.startswith("guest_"):
+            return jsonify({"code": 1002, "message": "请先登录账号", "data": None}), 401
+        return f(*args, **kwargs)
+    return decorated
+
+
 def admin_required(f):
     """装饰器：要求管理员或超级管理员权限。"""
     @wraps(f)
diff --git a/api/insurance/models/generation_task.py b/api/insurance/models/generation_task.py
index 2e8c2a4..3832c5a 100644
--- a/api/insurance/models/generation_task.py
+++ b/api/insurance/models/generation_task.py
@@ -79,6 +79,7 @@ class GenerationTask(db.Model):
         import json
         if idempotency_key:
             existing = GenerationTask.query.filter_by(
+                user_id=user_id,
                 idempotency_key=idempotency_key,
             ).filter(GenerationTask.status.in_(["queued", "running", "done"])).first()
             if existing:
diff --git a/api/insurance/poster/routes.py b/api/insurance/poster/routes.py
index 2bb2924..df19117 100644
--- a/api/insurance/poster/routes.py
+++ b/api/insurance/poster/routes.py
@@ -1,7 +1,7 @@
 """海报功能路由。"""
 import os
 from flask import Blueprint, request, jsonify, send_file
-from insurance.middleware.auth_middleware import jwt_required
+from insurance.middleware.auth_middleware import account_required as jwt_required
 from insurance.utils.response import success, error, ErrorCode
 
 poster_bp = Blueprint("poster", __name__)
diff --git a/api/insurance/ppt/routes.py b/api/insurance/ppt/routes.py
index 323220c..4f3a951 100644
--- a/api/insurance/ppt/routes.py
+++ b/api/insurance/ppt/routes.py
@@ -5,7 +5,7 @@ import json
 import logging
 from datetime import datetime
 from flask import Blueprint, request, jsonify, send_file
-from insurance.middleware.auth_middleware import jwt_required
+from insurance.middleware.auth_middleware import account_required as jwt_required
 from insurance.utils.response import success, error, ErrorCode
 
 logger = logging.getLogger(__name__)
diff --git a/frontend/src/utils/api.ts b/frontend/src/utils/api.ts
index 6da1cc1..6fb12c3 100644
--- a/frontend/src/utils/api.ts
+++ b/frontend/src/utils/api.ts
@@ -15,13 +15,7 @@ export function getAuthHeaders(): Record<string, string> {
   if (token) {
     return { Authorization: `Bearer ${token}` }
   }
-  // 访客模式：使用固定的 guest ID
-  let guestId = localStorage.getItem('guest_id')
-  if (!guestId) {
-    guestId = 'guest_' + Math.random().toString(36).substring(2, 10)
-    localStorage.setItem('guest_id', guestId)
-  }
-  return { Authorization: `Bearer guest_${guestId}` }
+  return {}
 }
 
 // 请求拦截器：自动添加 JWT
@@ -31,13 +25,7 @@ api.interceptors.request.use((config) => {
   if (token) {
     config.headers.Authorization = `Bearer ${token}`
   } else {
-    // 访客模式：使用固定的 guest ID
-    let guestId = localStorage.getItem('guest_id')
-    if (!guestId) {
-      guestId = 'guest_' + Math.random().toString(36).substring(2, 10)
-      localStorage.setItem('guest_id', guestId)
-    }
-    config.headers.Authorization = `Bearer guest_${guestId}`
+    delete config.headers.Authorization
   }
   return config
 })
diff --git a/tests/generation_routes_test.py b/tests/generation_routes_test.py
index 1a9805e..bc8d9f6 100644
--- a/tests/generation_routes_test.py
+++ b/tests/generation_routes_test.py
@@ -3,6 +3,7 @@ from pathlib import Path
 import sys
 
 from flask import Flask
+import jwt
 
 sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "api"))
 
@@ -21,6 +22,34 @@ def test_task_detail_returns_task_as_direct_data(monkeypatch):
         },
     )
 
+    app = Flask(__name__)
+    app.config["JWT_SECRET"] = "test-secret"
+    app.config["GUEST_MODE"] = True
+    app.register_blueprint(workspace_bp, url_prefix="/insurance/workspace")
+    token = jwt.encode({"user_id": "user-1"}, "test-secret", algorithm="HS256")
+
+    response = app.test_client().get(
+        "/insurance/workspace/tasks/task-1",
+        headers={"Authorization": f"Bearer {token}"},
+    )
+
+    assert response.status_code == 200
+    body = response.get_json()
+    assert body["data"]["status"] == "running"
+    assert "data" not in body["data"]
+
+
+def test_generation_tasks_reject_guest_identity(monkeypatch):
+    """生成物是账号私有数据，访客令牌不能读取任务。"""
+    called = False
+
+    def fake_get_task(_task_id, _user_id):
+        nonlocal called
+        called = True
+        return {"code": 0, "data": {}}
+
+    monkeypatch.setattr(task_service, "get_task", fake_get_task)
+
     app = Flask(__name__)
     app.config["GUEST_MODE"] = True
     app.register_blueprint(workspace_bp, url_prefix="/insurance/workspace")
@@ -30,7 +59,6 @@ def test_task_detail_returns_task_as_direct_data(monkeypatch):
         headers={"Authorization": "Bearer guest_test"},
     )
 
-    assert response.status_code == 200
-    body = response.get_json()
-    assert body["data"]["status"] == "running"
-    assert "data" not in body["data"]
+    assert response.status_code == 401
+    assert response.get_json()["message"] == "请先登录账号"
+    assert called is False
diff --git a/tests/ppt_task_lifecycle_test.py b/tests/ppt_task_lifecycle_test.py
index 2c0f536..4001165 100644
--- a/tests/ppt_task_lifecycle_test.py
+++ b/tests/ppt_task_lifecycle_test.py
@@ -105,6 +105,50 @@ def test_dispatch_failure_finishes_task(monkeypatch):
     assert synced and synced[0][0] == result["data"]["id"]
 
 
+def test_create_task_idempotency_is_scoped_to_user(monkeypatch):
+    """相同幂等键不能让一个用户复用另一个用户的任务。"""
+    filter_by_calls = []
+    created_tasks = []
+    other_user_task = _GenerationTask(user_id="user-1")
+    other_user_task.status = "done"
+
+    class OwnerAwareQuery(_Query):
+        def filter_by(self, **kwargs):
+            filter_by_calls.append(kwargs)
+            return _Query() if kwargs.get("user_id") == "user-2" else self
+
+        def first(self):
+            return other_user_task
+
+    class OwnerScopedGenerationTask(_GenerationTask):
+        query = OwnerAwareQuery()
+
+        def __init__(self, **kwargs):
+            super().__init__(**kwargs)
+            created_tasks.append(kwargs)
+
+    fake_db = types.SimpleNamespace(session=_Session())
+    compat_module = types.ModuleType("insurance.db.compat")
+    compat_module.db = fake_db
+    model_module = types.ModuleType("insurance.models.generation_task")
+    model_module.GenerationTask = OwnerScopedGenerationTask
+    monkeypatch.setitem(sys.modules, "insurance.db.compat", compat_module)
+    monkeypatch.setitem(sys.modules, "insurance.models.generation_task", model_module)
+    monkeypatch.setattr(task_service, "_dispatch_to_celery", lambda _task: None)
+
+    result = task_service.create_task(
+        user_id="user-2",
+        artifact_type="ppt",
+        operation="generate",
+        workspace_id="session-2",
+        idempotency_key="shared-key",
+    )
+
+    assert result["code"] == 0
+    assert created_tasks[0]["user_id"] == "user-2"
+    assert {"user_id": "user-2", "idempotency_key": "shared-key"} in filter_by_calls
+
+
 def test_cached_extraction_reports_completion(tmp_path, monkeypatch):
     """重复解析应命中缓存，并向调用方报告完成阶段。"""
     pdf_path = tmp_path / "plan.pdf"