diff --git a/src/langbot/libs/dingtalk_api/api.py b/src/langbot/libs/dingtalk_api/api.py
index c0a7492ad..6ead2027d 100644
--- a/src/langbot/libs/dingtalk_api/api.py
+++ b/src/langbot/libs/dingtalk_api/api.py
@@ -697,9 +697,10 @@ class DingTalkClient:
         if not await self.check_access_token():
             await self.get_access_token()
 
-        cardData: dict = {'cardParamMap': _stringify_card_param_map(card_param_map)}
+        template_params = dict(card_param_map or {})
         if card_data_config is not None:
-            cardData['config'] = json.dumps(card_data_config)
+            template_params['config'] = card_data_config
+        cardData: dict = {'cardParamMap': _stringify_card_param_map(template_params)}
 
         body: dict = {
             'cardTemplateId': card_template_id,
diff --git a/tests/unit_tests/platform/test_dingtalk_api.py b/tests/unit_tests/platform/test_dingtalk_api.py
index 03c84e97b..450128f3c 100644
--- a/tests/unit_tests/platform/test_dingtalk_api.py
+++ b/tests/unit_tests/platform/test_dingtalk_api.py
@@ -1,8 +1,11 @@
 """Tests for DingTalk API payload helpers."""
 
 import json
+from contextlib import asynccontextmanager
+from unittest.mock import AsyncMock
 
-from langbot.libs.dingtalk_api.api import _stringify_card_param_map
+from langbot.libs.dingtalk_api.api import DingTalkClient, _stringify_card_param_map
+from langbot.pkg.utils import httpclient
 
 
 def test_dingtalk_card_param_map_stringifies_select_component_arrays():
@@ -40,3 +43,41 @@ def test_dingtalk_card_param_map_stringifies_unregistered_structures():
 
     assert params['other'] == '["A"]'
     assert params['empty'] == ''
+
+
+async def test_create_card_embeds_layout_config_as_template_parameter(monkeypatch):
+    response = type('Response', (), {'status_code': 200})()
+    post = AsyncMock(return_value=response)
+
+    @asynccontextmanager
+    async def client_context():
+        yield type('HttpClient', (), {'post': post})()
+
+    client = object.__new__(DingTalkClient)
+    client.access_token = 'access-token'
+    client.robot_code = 'robot-code'
+    client.key = 'client-id'
+    client.logger = None
+    client.check_access_token = AsyncMock(return_value=True)
+    client._http_client_context = client_context
+    monkeypatch.setattr(httpclient, 'response_text', AsyncMock(return_value='{}'))
+
+    original_params = {'content': 'hello'}
+    delivered = await client.create_and_deliver_card(
+        card_template_id='template-id',
+        out_track_id='track-id',
+        open_space_id='dtv1.card//IM_ROBOT.user-id',
+        is_group=False,
+        card_param_map=original_params,
+        card_data_config={'autoLayout': True},
+    )
+
+    request_body = post.await_args.kwargs['json']
+    assert delivered is True
+    assert request_body['cardData'] == {
+        'cardParamMap': {
+            'content': 'hello',
+            'config': '{"autoLayout": true}',
+        }
+    }
+    assert original_params == {'content': 'hello'}