With the continuous development of power electronics technology,the load converters are constantly being connected to the power grid.So the power grid is progressively developing into a low inertia and less damping network,and the issues of power grid's security and stability are becoming increasingly prominent.Under the traditional control of converter,the load is difficult to participate effectively in the dynamic regulation of the power grid.Virtual synchronous motor technology can provide inertial support for the system so,it attracts people's attention.This paper introduces the principle of the load virtual synchronous motor,and establishes the small signal model of the load virtual synchronous motor,and it also gives a control parameter design method of the load virtual synchronous motor.This method can balance the stability and dynamic performance of the system.The Matlab/Simulink simulation results show that the correctness of the small signal model and the effectiveness of the design method which proves that it can provide some support for the stability of the power grid.