Abstract: Strabismus of wide baseline mapping camera is benefit for ground elevation measurements. Front view of small baseline mapping camera is benefit for location with high precision, reducing distortion and decreasing shelter. Double baseline is a novel mapping means, combining the advantages of wide baseline mapping and small baseline mapping. But it requires efficient cooling for high power equipment and high precision temperature gradient for large-scale mirror, which put forwards harsh requirements for thermal control system. In this paper, some measurements were adopted to design thermal control system for double baseline mapping camera, such as coupling the radiating surfaces, designing aluminum heat shield in the back of large-scale mirrors, disposing many thermal control loops, and using high-performance heat pipe enhanced thermal conductivity. Based on the analysis about camera's external heat flux, two extreme working conditions were determined. Hot working condition is =17,and focal plane assembly, electronics devices and controllers were all working. Cold working condition is =27, and the camera was in standby model. Considering with the interior heat fluxs and interface conditions, detailed thermal control schemes were established, and simulation results revealed the correctness of the thermal control schemes, and the temperature of various components met the design requirements. Our work can offer some thermal technique supports to study about mapping camera with double baseline.