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As the photovoltaic industry increasingly matured in China, photovoltaic power generation efficiency has received extensive attention. Because the level of photovoltaic power generation efficiency directly affects the efficiency of photovoltaic power generation, improving the efficiency of photovoltaic power generation is becoming a key factor in the profitability of photovoltaic power plants. It is imminent to find effective efficiency detection method. Based on this, the principle of testing the key equipment efficiency of PV power plant is mainly described and a case analysis is given in this paper, which could provide an effective reference for the efficiency test of PV power plant.