diff --git a/api/controllers/service_api/app/conversation.py b/api/controllers/service_api/app/conversation.py
index a0bd1b7412..815fd6a27a 100644
--- a/api/controllers/service_api/app/conversation.py
+++ b/api/controllers/service_api/app/conversation.py
@@ -7,7 +7,11 @@ from controllers.service_api import api
 from controllers.service_api.app.error import NotChatAppError
 from controllers.service_api.wraps import FetchUserArg, WhereisUserArg, validate_app_token
 from core.app.entities.app_invoke_entities import InvokeFrom
-from fields.conversation_fields import conversation_infinite_scroll_pagination_fields, simple_conversation_fields
+from fields.conversation_fields import (
+    conversation_delete_fields,
+    conversation_infinite_scroll_pagination_fields,
+    simple_conversation_fields,
+)
 from libs.helper import uuid_value
 from models.model import App, AppMode, EndUser
 from services.conversation_service import ConversationService
@@ -49,7 +53,7 @@ class ConversationApi(Resource):
 
 class ConversationDetailApi(Resource):
     @validate_app_token(fetch_user_arg=FetchUserArg(fetch_from=WhereisUserArg.JSON))
-    @marshal_with(simple_conversation_fields)
+    @marshal_with(conversation_delete_fields)
     def delete(self, app_model: App, end_user: EndUser, c_id):
         app_mode = AppMode.value_of(app_model.mode)
         if app_mode not in {AppMode.CHAT, AppMode.AGENT_CHAT, AppMode.ADVANCED_CHAT}:
diff --git a/api/fields/conversation_fields.py b/api/fields/conversation_fields.py
index 2eb19c2667..5bd21be807 100644
--- a/api/fields/conversation_fields.py
+++ b/api/fields/conversation_fields.py
@@ -202,6 +202,10 @@ simple_conversation_fields = {
     "updated_at": TimestampField,
 }
 
+conversation_delete_fields = {
+    "result": fields.String,
+}
+
 conversation_infinite_scroll_pagination_fields = {
     "limit": fields.Integer,
     "has_more": fields.Boolean,
diff --git a/api/services/conversation_service.py b/api/services/conversation_service.py
index ac9f577c32..f9e41988c0 100644
--- a/api/services/conversation_service.py
+++ b/api/services/conversation_service.py
@@ -162,5 +162,3 @@ class ConversationService:
         conversation.is_deleted = True
         conversation.updated_at = datetime.now(timezone.utc).replace(tzinfo=None)
         db.session.commit()
-
-        return {"result": "success"}, 200