In the DC micro-grid, the droop control is a basic control method to solve the problem of load sharing. The conventional droop control method is the U-I droop control based on the load current I. Although the reliability and economy of this method are better, due to the inconsistent line impedances or unbalanced local load between micro sources during real DC micro-grid operation, the load will not be shared accurately between DGs and then produce system circulation. A voltage incremental droop control method is proposed, which introduces the voltage change rate and corrects the output power of each DG by using the average power , to achieve reasonable load share and reduce the circulating current. The control method is simulated in the line impedance inconsistency and local load imbalance to verify the feasibility of the control method. This work is supported by Natural Science Foundation of Shanghai (No. 16ZR1413000).