Aiming at the current control error problem of permanent magnet synchronous motor caused by parameter disturbance,sampling delay and model mismatch,an improved deadbeat current predictive control based on sliding mode disturbance observer was proposed.By introducing the disturbance caused by the mismatch of model parameters into the voltage equation of the motor,a sliding mode disturbance observer was constructed to observe the system disturbance.〖BP(〗The predictive current in the sliding mode observer was used to replace the sampling current to solve the problem of control delay.〖BP)〗Aiming at the chattering problem of sliding mode control,a second-order reaching law based on sgn was designed to eliminate inherent chattering problem,and the stability of the controller was demonstrated.The problem of control delay was solved by substituting the predicted current in the sliding mode observer for the sampling current.The observed estimated system disturbance was combined with the deadbeat current predictive control through feedforward compensation,thus improving the parameter robustness of the deadbeat current control.The results show that the proposed control method can effectively compensate the system disturbance when the parameter disturbance and model mismatch occur,and the system steady state error is reduced,which effectively improves the system robustness.