SCR technology through the vehicle diagnostic system (OBD), vehicle emissions can be monitored in real time, display fault information in a timely manner to ensure the normal operation of the system.

Since the traffic safety detecting and diagnosing system has already been rather mature, the exploitation of remote monitoring system becomes the emphasis of the study of current monitoring system.

This paper introduces the structure and function of the vehicle Monitor system, the research and design of vehicle device, the research of supervisory center.