In order to achieve stable control of the swing mirror system over a wide temperature range, a design and optimization method based on capacitive angular displacement transducer is proposed. By analyzing the transfer function of the swing mirror system and the temperature characteristics of the capacitive angular displacement transducer, high-frequency composite ceramic materials are used as the sensor medium, and temperature drift suppression measures are taken through symmetrical differential measurement circuits and automatic gain control circuits to reduce the impact of temperature changes on the sensor output signal. Build an experimental platform to test the output voltage and deflection angle of the sensor within the temperature range of -40 ℃ to+60 ℃. The results show that the improved capacitive angular displacement sensor has a maximum temperature drift of 0.87 V, a maximum angle drift of 0.63′, and a temperature drift of 11.67 ppm/℃ in a wide temperature range, which is significantly better than the performance of traditional capacitive sensors. The temperature drift suppression measures adopted can effectively reduce the impact of temperature changes on the control accuracy of the swing mirror, and are suitable for high-precision swing mirror systems in a wide temperature range.