Under the influence of operating mode and operation environment,the parameters of permanent magnet synchronous motor change to a certain extent.In order to reduce the model mismatch caused by motor parameter changes and the problem of one-beat delay in digital system,the deadbeat current predictive control was combined with model-free control creatively.Aiming at the problems of complex and time-consuming of perturbation estimation in the traditional model-free control,linear extended state observer was introduced to estimate the system disturbance and perform feedforward compensation.The feasibility of the proposed model was analyzed by comparing with the simulation of permanent magnet servo system based on traditional PI control.The simulation results show that the proposed method improves the dynamic response performance of permanent magnet synchronous motor control system and has stronger robustness.