Topic: The Design of Lane Keeping Assists System and Simulation. Describe: This paper focuses on the vehicle lane keeping system, which is one of the active safety technologies. It not only warns of track deviation during driving but also relies on the active steering technology to control the vehicle to avoid danger actively, keep in the lane and stabilize the vehicle yaw. For the problem that the lane keeping warning and active control function may conflict with the driver's intention, the driver's operation intention will be simulated and judged. In order to verify the accuracy of the lane-keeping system control algorithm, the joint simulation experiment of MATLAB/Simulink and CarSim will be carried out, which provides a theoretical basis for the real vehicle test..