To design a grid-connected PV simulator, using IRF3205 FET and IR2110 to get a H full-bridge to fulfill DC-AC conversion,, SCM STC12C5A60S2 was used to control feedback circuit and generate PWM, STC12C5A60S2 was used to complete system control, frequency tracking and phase synchronization were achieved in the simulator in more efficient transmission, less distortion, the experiment device was stable and to meet the design requirements, experiments showed that the design method was effective.