This paper introduces virtual complex impedance and proposes an improved droop control on the basis of analysis of multiple-inverters parallel in low voltage microgrid. Then, the output impedance of inverters can be resistive under the conditions of mains frequency, and the current-sharing of multiple-inverters parallel is improved. By using dual loops control of capacitor voltage and current, it studies the effect of parameters selection of virtual complex impedance on restraining circulation, then determines the parameters. According to the comparison of amplitude frequency characteristics of the output impedance, it analyses the characteristics of output impedance of inverter under different control parameters. And, an improved droop control is proposed and combined with virtual complex impedance through theoretic analysis and calculation. In the end, by choosing the values of parameters which have been studied, the simulation analyzes the effects of parameters of virtual complex impedance on output voltage and the advantages of the improved droop control. And the simulation results prove that the strategy proposed is effective.