Abstract:  Based on the vehicle location information provided by the BeiDou Navigation Satellite System, the intelligent road marking system based on the BDS is designed and simulated to solve the traffic congestion in the central city road. The system uses the position information and road parameters provided by the BeiDou positioning terminal in the vehicle as variables, establishes a realtime traffic model of the road based on the lane occupancy, and guides the traffic flow through the LED color change of the signpost. Finally, based on PC and the serial communication of singlechip simulates the running flow of the system. The effective implementation of the system has a certain practical value.