Abstract: At present, tram system mainly adopts the “manual driving, visual control” mode in operation, the automation level is low. Besides, in strong light, rainy or foggy days, when the sightline is blocked, the pedestrians and social vehicles violate the traffic rules, it is very likely that the driver could not handle the emergency in time and consequently, the tram operation and pedestrian safety will be affected. A design method of on-board train control system based on the energy storage tramcar in Huai′an City is proposed, so as to realize the automatic driving of tramcar. By adding a redundant safety IO (input output) controller in the train control system, the interaction among train network, IO control and signal equipment are realized, which can minimize the design changes of the original system. This design method has been practically verified on the Huai'an tram system.