A motor torque smoothing process method includes judging the required work mode of the motor (3) and the current work mode of the motor (3); judging the transition process of the motor (3) based on said required work mode and said current work mode; determining the smoothing time parameter of the motor torque and the target torque based on said judged transition process; calculating the increasing step length of the current output torque based on the said detailed smoothing time parameter, the target torque and the current actual output torque; therefore calculating the actual output torque based on said increasing step length and the current actual output torque.