Abstract: In this paper,the generation capacity of solar cells in the near space is analyzed under the influence of solar radiation intensity,cell temperature,flight time,position and attitude. The model of actual power generation and total generation energy of solar cells used by the near space vehicles is established,and the calculation program is compiled for simulation. The variation trend of solar cell output under the influence of different flight time,geographic latitude,flight altitude,flight attitude and battery temperature factors in the near space,as well as the total generation energy per day under the influence of multiple factors are obtained,which has certain guiding significance for the design and layout of solar cells for the near space vehicles.