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This paper solved mainly thunder-lightning protection of the outdoor solar cells arrays and indoor controller and inverter. The lightning rod installed prevented outdoor solar cells arrays from thunder-lightning directly stroke, and the lightning arrester and lightning belt fixed prevented indoor controller and inverter from thunderbolt induction and invasive lightning wave. The protection project was multilevel and compositive to achieve the solar cells arrays and controller and inverter of grid-connected power system in photovoltaic station, and it is economic and feasible. The project has important significance at scientific research and expansive prospect in the market.