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For increasing the generation capacity and earnings of photovoltaic power station, the optimal method is proposed in this paper that dividing a year into several periods and calculating the optimum tilt angle of photovoltaic array in each period. Labview language is used to develop calculation software. Taking Shenyang city in Liaoning province for example, the total irradiation received on the surface of photovoltaic modules under fixed angle and multiple angle are compared. The investment and earnings in the case of fixed angle and multiple angle are compared in detail. The experimental platform is set up and the comparative experiments are carried out. The experimental results show that the power generation of multiple angle array is significantly higher than that of fixed angle array. The power generation is increased by 2.27% in April and by 6.21% in May. [ABSTRACT FROM AUTHOR]