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Microgrid is an effective form of the DGs (distributed generation) integration on distributed network. Through the coordination by energy storage and control devices, microgrid can restrain the negative influence by the DG output fluctuation on the distributed network and buffer the impact of EV charging load effetely. The harmful effect which EV Chargers bring on the microgrid is their nonlinearity will lead to harmonic pollution to the microgrid. Meanwhile EV batteries fully charged can serve as micro-sources which support the operation of the microgrid in island mode. The harmonic distortion caused by EV chargers in the microgrid is studied in this paper and the operation characteristics of the microgrid in island mode supported by EV batteries is presented.