In order to study the influence of impact load on the reliability of hydraulic motor in large vehicle equipment during starting and braking,the acceleration generated by flywheel inertia was used to simulate the impact of vehicle equipment under laboratory conditions.A flywheel reliability test bench was designed and flywheels with different moment of inertia were put forward as hydraulic motor loads to meet the reliability test and impact test requirements of various types of hydraulic motors.AMESim was used to build the hydraulic circuit of the test bench,and the impact simulation test of the tested motor was carried out to test the related performance.The simulation and test results were compared and analyzed.It is found that the two test results are basically consistent,which verifies the correctness of the hydraulic system principle and proves that the design of the test bench is reasonable.