By describing the characteristics and the prospects of commercial application of current micro-grid, this paper analyzed the possible investors, operation subject and main users of micro-grid, and built the corresponding operating modes on this basis. Furthermore, based on the existing national policies and power grid management policies, this paper conducted an analysis of the feasibility and reliability of every operating mode and worked out several operating modes which are in line with regulations of our country and at the same time ensure the security of power grid.