The coating process of white inorganic coating on aluminum honeycomb sandwich plate in satellite structure was investigated.The effects of grinding process on strength of structural board and adhesion of coating were investigated.And the effects of curing at lower temperature on the appearance,thickness and thermal radiation properties of the coating were studied.The results show that the cross grinding of 80^# sandpaper for 2 to 3 times can satisfy the adhesion of inorganic coating on the surface of structural board,and there are no effects on the strength of 0.3 mm thick skin structural board.The strength index still meet the strength requirement of thin-walled honeycomb sandwich.There are no obvious changes in the strength of structural board before and after grinding.The curing process of 85 ℃/12 h can meet the requirements of appearance,thickness and thermal radiation properties of the coating.