diff --git a/apps/third/dahua.py b/apps/third/dahua.py
index c6ddc062..d4137997 100644
--- a/apps/third/dahua.py
+++ b/apps/third/dahua.py
@@ -149,7 +149,7 @@ class DhClient:
             d_code = code.split('$')[0]
             json_data['deviceCode'] = d_code
             json_data['params'] = '{\"method\":\"dev.snap\",\"id\":123,\"params\":{\"DevID\":\"' + \
-                str(d_code) + '\",\"DevChannel\":' + code + ',\"PicNum\":1,\"SnapType\":1,\"CmdSrc\":0}}'
+                str(d_code) + '\",\"DevChannel\":\"' + code + '\",\"PicNum\":1,\"SnapType\":1,\"CmdSrc\":0}}'
         _, res = self.request(**dhapis['dev_snap'], json=json_data)
         res = json.loads(res)
         return self.get_full_pic(res['params']['PicInfo'])