Abstract. Based on the NaSch traffic model, we propose a mixing traffic flow model for a multilane system. In this model, the characteristic of Self-driving, Cooperating Cars are abstracted as rules, to make the traffic model can be applied to the traffic with Self-driving, Cooperating Cars. Through the simulation in the model, we found that the Self-driving, Cooperating Cars have a great influence on the capabilities of expressway, and have a decisive action on waiting time before traffic light.