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Grid-connected photovoltaic power system is not only related to solar battery and grid inverter technology, but also involves the system control and optimization problem. The research and improvement about control technology play a vital role in improving the efficiency of the system and Realizing optimization grid. On the basis of considering about control requirements in grid-connected photovoltaic power system, the paper analyzes comprehensively the control technology about MPPT, grid of inverter and island detection. At last, the paper points out the research hotspots and development trend in each part.