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An airborne special equipment is hung outside the aircraft, and the precision instrument inside the cabin is sensitive to temperature. It needs to work at the temperature range of 10℃~30℃. A high reliable temperature control system is designed for an airborne special equipment cabin. The system uses pure hardware circuit to control the heating path, and reports the working state of the temperature control system through software. In order to improve the reliability of the system, several measures are taken, such as the design of independent control in different areas, the redundant design of temperature sensor and electric heating element, and the design of three judge two of temperature control circuit. The test results show that the accuracy of temperature acquisition is better than 0.4℃ the accuracy of heating channel connection is better than 0.4℃, the accuracy of heating channel disconnection is better than 0.2℃, and the temperature control system can stably control the cabin temperature within the range of 10℃~30℃.