In order to improve the response speed of the control system in the process of vehicle braking,the nonlinear PID control optimization system of vehicle hydraulic braking was designed,and the effect of braking pressure tracking was simulated.The plane graph of the vehicle hydraulic braking system was given,and the working principles of the hydraulic system in the process of vehicle driving and braking were analyzed.The mathematical model was used to simplify the hydraulic brake system of the vehicle,and the nonlinear PID control system was designed for the input uncertainty.The genetic algorithm was used to optimize the nonlinear PID control system,and the optimization process of the nonlinear PID control system of the hydraulic brake was given.Under the conditions of different initial state and different pressure signal,MATLAB software was used to simulate the tracking error of the brake pressure,and the simulation results were compared and analyzed with those before optimization.The simulation results show that in the nonlinear PID control system,the tracking error of the hydraulic brake pressure is large,and the adjustment speed of control parameters is slow;in the nonlinear PID control system optimized by genetic algorithm,the tracking error of hydraulic brake pressure is small,and the adjustment speed of control parameters is fast.By using the genetic algorithm to optimize the nonlinear PID control system,the response speed of the whole system can be improved and good braking effect can be obtained.