Abstract: Long endurance aircraft in aerospace（stratospheric airship,solar powered plane,high altitude scientific balloon,etc.）can stay in near space for a long time. It is an ideal experimental platform for all kinds of loads and has become a research hotspot across the whole world in recent years. At present,the main energy source of near space long endurance aircraft is solar cells. Due to the different shape and volume of aerospace vehicles,the installation location and area of solar cells are also different. Some long endurance aircraft have limited pavement area. In order to achieve energy balance,solar cells with larger laying area will encounter irregular shape laying method. At this time,the calculation process of power generation prediction is complex and slow. This paper proposes a power generation model based on the relationship between solar cells,and the simulation analysis of the existing aircraft with irregular solar cells is carried out. The simulation results show that the model can accurately predict its power generation capacity. Meanwhile,the model can also solves the problem of complex and slows calculation process of irregular solar cell power generation capacity.