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The energy management system(EMS) is very important for the stable operation of microgrid with multi-micro sources. In this paper, the model of microgrid consisting of micro sources such as PV, storage battery and fuel cells is built. In the grid-connected mode and islanding mode, the EMS control strategy is designed and analyzed. Through the EMS corresponding control, each micro sources unit controller performs the transfer between the working manners, the transfer between the control methods, the output of active power and reactive power to ensure microgrid operate stably. Under the various operation conditions, the simulation results verifies the proposed EMS control strategy correctness and feasible.