Abstract: A closed-loop control simulation model of variable frequency drive hydraulic winch system was built using AMESim, and the dynamic characteristics of the hydraulic winch system under different load mutations were simulated and analyzed using the model. The simulation results show that the variable frequency drive hydraulic winch system can realize accurate control of drum speed. In the process of no-load and on-load start-up, the lifting speed of the drum can reach the target speed after short-term fluctuation, and the final deviation between the actual displacement of the drum and the target displacement in two cases is not more than 0.1 m. Under the start-up with load, the variable frequency drive hydraulic winch system has good response and tracking characteristics to speed step and sinusoidal changes, and the drum speed of winch is insensitive to the change of load, and the speed stability with load is good.