With the continuous penetration of renewable energy, the management of micro-grid shows complexity and diversity. The development of efficient scheduling strategy can not only reduce the burden of the large grid, but also achieve mutual benefit and win-win situation.This paper focuses on such a micro-grid with a wind generator,a photovoltaic system, a diesel generator and an energy storing device.In the case of incorporating the external power grid, the interactive potential between the user side and the micro-grid is maximized, and the optimal scheduling strategy is coordinated between the outputs of each micro power source.Finally, according to the proposed evaluation indexes, each optimal scheduling strategy is evaluated.The effectiveness and rationality of the proposed scheduling strategy are verified by simulation and calculation of evaluation indexes.