Abstract: In order to ensure the working environment of the high-resolution camera focal plane assembly and reduce the temperature rise of the CCD assembly as far as possible, the thermal control design of the focal plane assembly is needed. Based on the analysis of the thermal control characteristics of the focal plane assembly of a high-resolution camera, a thermal control scheme combined a flexible thermal strap and a fixed radiant plate with compensate heating was put forward according to its structure and installation position, and the cooling path was designed. The thermal model of the camera was established by thermal analysis software, and the simulation calculation were carried out. The results show that after 600 s of continuous operation, the temperature of the shell is between 15.0 ℃ and 24.1 ℃, and the temperature of the CCD assembly increases by 11.1 ℃. By adding phase change heat pipe, the temperature rise of CCD assembly is reduced to 7.2 ℃, which meets the thermal control requirement. Finally, the thermal balance test on the camera was carried out. The results show that after the focal plane assembly works continuously for 600 s, the shell temperature ranges between 15.1 ℃ and 22.6 ℃, and the temperature rise of CCD assembly is no higher than 7.2 ℃. The experimental results are in good agreement with those of thermal analysis. It is indicated that the thermal design for the high-resolution focal plane assembly is correct and feasible, which provides reference for the thermal design of similar high-power parts.