Abstract: With the continuous increase of the scale of new energy development during the "14th Five-Year Plan" period, the "double high" characteristics of the power system will be more prominent, resulting in the lack of moment of inertia and damping of the new power system, and the frequency stability is threatened. Virtual synchronous generator（VSG） technology introduces virtual inertia and virtual damping to support the stability of power grid frequency. Introduces the principle of VSG control by describing the rotor mechanical motion equation and the reactive power-voltage governing equation, and summarizes the current research hotspots of VSG from the perspectives of active power-frequency control, reactive power-voltage control and seamless switching technology. Some reference ideas are provided for VSG’s power coupling, current limiting protection, low voltage crossing, multi-machine parallel cooperative control and other problems.