diff --git a/apps/tools/serializers/tool_workflow.py b/apps/tools/serializers/tool_workflow.py
index 0cdba24ddec..49ad5f97136 100644
--- a/apps/tools/serializers/tool_workflow.py
+++ b/apps/tools/serializers/tool_workflow.py
@@ -182,6 +182,9 @@ def list_knowledge(self, with_valid=True):
                 self.is_valid(raise_exception=True)
             workspace_id = self.data.get("workspace_id")
             user_id = self.data.get('user_id')
+            if workspace_id == 'None':
+                return [{**KnowledgeModelSerializer(k).data, 'scope': 'SHARED'} for k in
+                        QuerySet(Knowledge).filter(workspace_id='None')]
             knowledge_workspace_authorization_model = DatabaseModelManage.get_model('knowledge_workspace_authorization')
             share_knowledge_list = []
             if knowledge_workspace_authorization_model is not None:
@@ -376,7 +379,6 @@ def get_appstore_templates(self):
             return {'apps': [], 'additionalProperties': {'tags': []}}
 
 
-
 def update_resource_mapping_by_tool(tool_id: str, other_resource_mapping=None):
     from application.flow.tools import get_instance_resource, save_workflow_mapping
     from system_manage.models.resource_mapping import ResourceType
@@ -388,4 +390,4 @@ def update_resource_mapping_by_tool(tool_id: str, other_resource_mapping=None):
     save_workflow_mapping(tool.work_flow, ResourceType.TOOL, str(tool_id),
                           instance_mapping + other_resource_mapping)
 
-    return
\ No newline at end of file
+    return