The disadvantage of the conventional droop control scheme of DC micro-grid is that it should compromise between the reasonable load share and voltage regulation. In order to achieve the same load ratio among the microsources of different capacity, an improved droop control method is proposed based on the low-bandwidth communication (LBC), in which the load share accuracy and reasonable voltage deviation is achieved by load share compensation and voltage deviation compensation respectively. The multi-source DC network with the improved droop control approach is modeled to analyze its small-signal stability. The mechanism of stopping sending power signal from the over-loaded sources because of the miss setting of droop coefficients is introduced to ensure the microsystem operation. A 3-source 6 –bus DC micro grid is built in Matlab/Simulink to check the overall behavior of the proposed approach. The hot swap and the scenario of some micro sources over-loaded with others at lower load rate due to improper setting of droop coefficients is simulated. The simulations verify that the stability, the power share accuracy and the voltage deviation quality can be achieved by the proposed approach.