With an increasing growth of the automobile industry and the Internet, it has become a new trend to replace manual driving with intelligent driving relying on computer system. Although the ACC adaptive cruise technology still requires manual driving, the electronic control program can be used to maintain a reasonable following distance in the traffic flow. Based on unmanned driving and adaptive cruise control theory, this paper proposes a driving mode between these two, i.e., when two cars are driving in the same direction, the front car drives manually and the rear car will follow automatically. Moreover, Solidworks is adopted for vehicle 3D modeling. The motion simulation plug-in is used to simulate the state of the acceleration, deceleration, uniform straight line and corner steering motion for the front vehicle, and then observe the following vehicle following situation，obtaining the corresponding vehicle following dynamics simulation results.