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Hydraulic engine mounts are a typical non-linear system. Compared with rubber mount, it has good dynamic characteristics under different excitation, so it has been widely used in automobiles. The vibration isolation performance of hydraulic engine mounts is related to its dynamic characteristics, and its dynamic characteristics are closely related to mount model parameters. Therefore, parameter identification of hydraulic engine mounts has become a prerequisite for studying its dynamic characteristics and even vibration isolation performance. Aiming at the damping parameters of mount model parameters, based on Volterra series theory, this paper takes the inertial track-floating decoupler hydraulic engine mount as the research object, and proposes the identification method of the damping phase angle of the hydraulic engine mount and the damping parameters of the fluid damping mechanism.