Abstract: In response to the mission requirements of maintaining high stability and uniformity of temperature throughout the camera’s lifespan of PRSS-1 satellite, the key points and challenges of thermal control design were analyzed by establishing a thermal resistance network model. In addition, methods for effectively managing heat transfer and designing of thermal control were proposed. An integrated structural thermal control design was employed to solve the difficulty of high-power density heat dissipation in the dual camera focal plane circuit. The temperature stability of the main optical structure was improved by a combination of direct and indirect thermal control methods. The accuracy of thermal design was verified by thermal simulation analysis and thermal balance test. The temperature changes within one month after four years of operation in orbit show that the temperature level and stability of each part of the camera meet the requirements of the design index, with the temperature fluctuation ranging from 0.09 ℃ to 0.17 ℃ for the lens, and from 0.93 ℃ to 4.30 ℃ for the CCD, indicating that the thermal control design is reasonable and effective. The above design practice may provide a reference for the integrated thermal control design of the satellite's dual camera system.