With the development of productivity and the increase of logistics transport, double-hung trains came into being, but the traffic accidents caused by them are also very serious. Based on vehicle parameters, this paper completed the design of the braking system, and built an A-double model based on Trucksim software to establish the braking system and conduct simulation analysis on typical working conditions. The optimized design results show that the vehicle equipped with fuzzy anti-lock system has the shortest braking distance, and the braking efficiency of A-double is improved compared with the vehicle without anti-lock system or equipped with traditional anti-lock system.