Hello @KunLi-4284 ,
it seems you are combining both output mechanisms for IoTHub with Azure Stream Analytics (built-in endpoint) and Service Bus (Routing to a custom endpoint).
Check out the comments:
When you add your first route, the default endpoint is not getting any messages anymore because it overrules by the routing.
You can easily restore the behavior of the default endpoint (sending messages to Azure Stream Analytics) by adding this extra route to 'events':
See also the documentation.