According to the shortcoming of the droop control that it’s difficult to keep rated frequency or voltage amplitude small deviation in island operation mode when the load changes, a new control method of inverter source with mixed output characteristics is proposed. It combines the characteristics of V/f control and droop control, and overcomes the shortcoming of the two methods respectively. A new multiple master-slave control strategy is proposed based on the new control method of inverter source. The strategy can operate by itself automatically according to the default margin without telecommunication, and overcome the shortcoming of the peer to peer control and the master-slave control based on single V/f source. Finally, a simulation model for micro-grid is developed on the DIgSILENT software, the control method of inverter source and the multiple master-slave control strategy of micro-grid are tested. The correctness and feasibility are verified by the simulation result.