This study aims to realize the seamless transfer between grid-connected mode and islanding operation for microgrid, and minimize the transient impact caused by the Power mismatch at the switching moment. Firstly, this study presented the topology characteristics of the wind/photovoltaic/storage microgrid, and analyzedthe operational control characteristics of energy storage converters. And then this study proposed a control strategy of seamless transfer for the wind/photovoltaic/ storage microgrid with various types of energy storage. Finally, the simulation model and communication architecture of a wind/photovoltaic/storage microgrid are built in PSCAD/ EMTDC simulation platform. The simulation results verify the effectiveness and validity of the control strategy of seamless transfer between grid-connected and islanding operation for microgrid under different operation conditions.