diff --git a/pipeline_service/workspace.py b/pipeline_service/workspace.py
index 8090e92..f82be1e 100644
--- a/pipeline_service/workspace.py
+++ b/pipeline_service/workspace.py
@@ -275,6 +275,31 @@ async def get_project_dir(sor, uid, session_id=''):
     return os.path.join(space_dir, 'projects', dname), workspace_base
 
 
+async def get_project_dir_pl(sor, uid, session_id='', pipeline_id=''):
+    """产线隔离版：会话项目与指定产线不一致时视为无项目（返回空目录）。
+
+    商机/投标产线入口的工作空间不能显示开发产线项目的空间——
+    会话里残留的跨产线项目（如元景项目）不应劫持本产线的工作空间。
+    pipeline_id 为空时不做隔离（向后兼容旧调用）。
+    """
+    if not pipeline_id:
+        return await get_project_dir(sor, uid, session_id)
+    pid = await get_session_project_id(sor, uid, session_id)
+    if pid:
+        try:
+            r = await sor.sqlExe(
+                "SELECT pipeline_id FROM sd_projects WHERE id=${p}$ LIMIT 1",
+                {"p": pid})
+            if r:
+                proj_pl = getattr(r[0], 'pipeline_id', '') or ''
+                if proj_pl != pipeline_id:
+                    # 跨产线项目：视为本产线无项目（与 gateway 的隔离一致）
+                    return '', await get_workspace_base(sor)
+        except Exception:
+            pass
+    return await get_project_dir(sor, uid, session_id)
+
+
 async def get_project_apps_modules(sor, uid, session_id=''):
     """读项目目录下 {应用名}_spec.json，返回 (apps, modules)。
 
@@ -488,6 +513,7 @@ def load_workspace():
     g.get_workspace_path = get_workspace_path
     g.get_space_dir = get_space_dir
     g.get_project_dir = get_project_dir
+    g.get_project_dir_pl = get_project_dir_pl
     g.get_project_apps_modules = get_project_apps_modules
     g.get_session_project_id = get_session_project_id
     g.get_session_context = get_session_context