将太阳电池板蜂窝芯子、面板和硅电池片中发生的辐射 -传导复合传热过程等效为一个无内热源的三维瞬态热传导问题。根据电池板的材料、尺寸及结构形态导出太阳电池板的三维等效导热系数。针对任意两相邻电池板表面间的热辐射交换规律 ,构造适用于这两个表面内节点温度的离散方程系数。研究折叠状太阳电池阵边界节点的热特点时 ,仔细考虑了地球红外辐照、地球的太阳反照、太阳辐射加热、航天器舱体几何遮挡、深冷环境散热、飞行轨道高度及航天器在太阳 -地球系中不同位置等造成的影响。利用本文给出的方程 ,可以求出展开前在轨折叠状太阳电池阵三维瞬态不稳定温度场 The radiative-conductive composite heat transfer process in a solar cell honeycomb core, panel, and silicon cell is equivalent to a three-dimensional transient heat conduction problem without an internal heat source. The three-dimensional equivalent thermal conductivity of the solar panel is derived according to the material, the size and the structure of the solar panel. According to the rule of heat radiation exchange between the surfaces of any two adjacent panels, the discrete equation coefficients suitable for the temperature of the nodes in the two surfaces are constructed. When studying the thermal characteristics of the boundary nodes of folded solar arrays, we carefully considered the effects of infrared radiation on the earth, sun’s reflection on the earth, heating of solar radiation, geometrical shelter of spacecraft capsules, heat dissipation in cryogenic environments, altitude of orbital altitude, - the Earth Department in different locations such as the impact. Using the equation given in this paper, we can get the three-dimensional transient instability temperature field of on-track folding solar array before unfolding