Abstract: This paper summarizes the measures to reduce the kilowatt-hour cost of photovoltaic power plants, including the following aspects: modifying the fixed value of the inverter to extend the grid-connection time, conducting five-point and four-stage PR evaluation to analyze the loss of each stage, and taking measures to eliminate PID effect to improve the power generation. At the same time, change the start and stop mode of the inverter cooling fan, adjust the gear of the main transformer tap-changer, strengthen the daily power management measures to reduce the power consumption of the comprehensive plant.