Abstract: In order to ensure the working performance of focal plane charge coupled device (CCD) space ultraviolet imaging spectrometer (UVIS) at low temperature, it is necessary to carry out the heat dissipation design of focal plane CCD. Firstly, according to the heat consumption, working mode and temperature requirements of focal plane CCD, a heat dissipation design scheme with high-performance flexible graphite thermal strap as the main measure was proposed, a thermal simulation model was established, and the thermal analysis was performed. Then, the thermal balance test of focal plane CCD was carried out under vacuum. The test results show that the temperature difference between the CCD connecting end of the flexible thermal strap and the connecting end of the heat pipe is only 2.3 ℃, inferring that the thermal resistance of the thermal strap is 0.65 ℃/W, which meets the design requirement of thermal resistance smaller than 1 ℃/W and means good thermal conductivity. The temperature of focal plane CCD in long-term working mode is -21.4 ℃, which meets the requirement of working temperature lower than -20 ℃. Both simulation analysis and experiment show that the heat dissipation design scheme of focal plane CCD using flexible graphite thermal strap combined with heat pipe is reasonable and feasible.