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With respect to output power degradation of solar cell influenced by space environment, a back surface field silicon solar cell array supplying power for a LEO (Low Earth Orbit) satellite running on dawn-dusk sun synchronous orbit is selected as a sample. Details on orbit semi major axis perturbance, LTDN (Local Time of Descending Node) shift, solar incidence change, and variation of distance from the Sun to the Earth are discussed. Situations involving solar cell array output current and working temperature are investigated and analyzed to build a fitting model from telemetry. To mitigate solar power variation influence, a new method has presented to normalize the fitting current with solar array temperature that is based on solar incidence and output power temperature coefficient. Validated by telemetry data, the results have shown that normalized current has a better consistency of degradation with a sudden declination of 2.35% after 3 years on orbit to indicate that solar array has about 40 branches among which one is probably open in circuit, and is high in winter and low in summer, and has degraded with exponential factor of -1.034′10_^-5/d that is equivalent to 0.377% annually. Prediction is that current degradation in summer is lower than 8.5% in 17 years of satellite working on orbit. Degradation illustrates that indigenous silicon solar cell has a better anti-irradiation performance in near Earth space and is applicable to LEO satellite of long life. The results can be used to assist power supply balance, telemetry diagnosis and device SOH (State of Health) evaluation for long term management of satellite in TT C (Telemetry, Tracking and Command).