Aiming at the problems of the traditional fieldweakening technology such as large current and torque ripple and current regulator easily saturated in deep fieldweakening operation, a deep fieldweakening control strategy based on increment and error integration of qaxis current was presented. Firstly, the qaxis current change rate was slowed down by qaxis current error integral control to restrain the current regulator from saturation. Then according to the curve of the maximum torque per voltage limit daxis current, giving the qaxis current increment, replanning PMSM fieldweakening current trajectory. Combined with the current loop fuzzy PI, to further inhibit the current and torque ripple in deep fieldweakening operation. The simulation results showed that under the fluxweakening control strategy, the ripple of current and torque and the saturation of the current regulator in deep fieldweakening operation were obviously restrained, and the system was stable.