In view of the flaws of the low speed running state of the permanent magnet synchronous motor, the low signal-to-noise ratio of its effective signal, and the low efficiency of the speed and rotor position detection, a proposal has been made of the high frequency injection permanent magnet synchronous motor (PMSM) sensorless control method. The sensorless self-detection of rotor speed and position can be achieved through continuous high frequency signal injection, which helps PMSM possess salient polarity. A speed control module, a rotor position tracking observation module, and other functional modules are established on the work platform of Matlab/Simulink for a simulation test, which results verify the feasibility of the control method.