A perfect first-aid system for breakdown vehicle is an important part of Intelligent Transportation System.It plays a significant role in raising the efficiency of expressway operation and service.This paper gives the aim and characteristic of the first-aid system.Basing on this concept,the architecture of the system is put forward,and the structure and the function of the long-distance fault diagnosis center are analyzed in detail.Then the authors introduce the configuration and the function of the first-aid vehicle.At last,the work flow of this system is described.