In a variety of distributed energy (DG) in parallel operation system, because of the influence of the line impedance, can cause the loss of line voltage, the traditional droop control cannot be effectively to realize the rational distribution of power system. Aiming at this problem, this paper firstly analysis the traditional droop control algorithm theory, combining with the inverter output impedance and line impedance, and put forward a new droop control strategy based on virtual impedance. The paper analyzes the relationship between the system power and voltage, frequency, and discusses the system of two inverter parallel operation mechanism of circulation, introducing the power differential link to improve the system dynamic response. Using new droop control, effectively reduce the load mutates bus bar voltage amplitude and frequency fluctuations, restrain system reactive power flow between the inverter, realize the precise power distribution system, improve the stability of the system. Through the simulation analysis, validate the feasibility and practicability of the control strategy.