Abstract: In order to improve the impact stability of the hydraulic impactor, a hydraulic variable frequency shaker with rotating structure was designed, and the control equations of return and stroke motion were given, and the simulation analysis of parameter optimization was carried out by using Simulink platform.The results show that: the piston still keeps accelerating motion when entering the impact stroke stage, but the acceleration decreases gradually.When entering the return movement stage, the piston accelerates with decreasing acceleration first, and then decelerates with increasing acceleration, thus realizing the acceleration return movement of the piston. When the frequency of the shaker is gradually increased, the output amplitude of the system is reduced, and the vibration center is moved upward.When the frequency of the shaker is gradually increased, the system reaches a larger output acceleration, which is opposite to the trend of displacement. When the vibration mass of the hydraulic vibration system is too small, the system can only produce a small excitation force. With the increase of the vibration mass, the excitation force also increases.