The load of air conditioner has become one of the main loads during summer in China, which becomes a big threat to the stable operation of power system. The load virtual synchronous technology can sense the state of the grid, and participate in primary frequency control of state grid to stabilize the grid on the demand side. Firstly, the mechanism of participating in power system primary frequency control with variable frequency air conditioner controlled by virtual synchronous machine technology is illustrated. Then，load response regulation strategy and control methods of the air conditioner virtual synchronous machine are proposed. Lastly, the effectiveness of load response regulation strategy and control methods of the air conditioner virtual synchronous machine are confirmed by simulation.