Different current control methods were adopted in motor control according to different occasion requirements. Four main current control methods of permanent magnet synchronous motor were analyzed and their characteristics were summarized. The changes of daxis and qaxis current, stator current and power factor were analyzed when the torque was the same for the maximum torque per ampere (MTPA) control, zero daxis current (id=0) control, unity power factor (cosφ=1) control and constant flux linkage control. Four simulation models were built in MATLAB/Simulink software corresponding to different control methods. The simulation results of four current control methods showed that the stator currents from high to low were those of cosφ=1 control, constant flux linkage control, id=0control, MTPA control; the power factors from high to low were those of cosφ=1 control, constant flux linkage control, MTPA control, id=0 control. Finally, the changes of current and power factor of four control methods were compared and analyzed when salient coefficient was different.