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Most micro sources need to use the inverter system to connect the grid. Because the microsources are intermittent and easily affected by the adverse weather, also the reason of getting the maximum power output, the capacity of inverter system is larger enough than need and its utilization rate is not high. Microgrid power quality is a new emerging area of research and drawing more attention. Based on the same main circuit configuration of gird-connected inverter of microsource and active power filter, a feasibility study for inverter multiplexing is put forward. An energy supply and filtering composite system based on gird-connected generation and active power filter and its uniform control method is presented. The generator can work as gird-connected inverter and active power filter simultaneously, which exerts the advantage of distributed generation, and improves the power quality. Theoretic analysis, simulation and experiment proved the feasibility of this scheme.