The influence of the parameters of the damping valve on the performance of the hydraulic damper was analyzed. A type of antihunting damper was taken as the research object and other factors to the performance of hydraulic damper was not considered, the influence of damping valve’s spring preload on the performance of hydraulic damper was studied by experiment. The experimental results indicate that the spring preload of damping valve mainly affects the performance of hydraulic damper after the damping valve is opened. After the damping valve is opened, the dynamic stiffness of the rebound stroke increases with the increase of the pretightening force, the dynamic stiffness of the compression stroke is not affected; the compressive and tensile damping coefficients increase with the spring preload.