Abstract: In order to solve the problem of unstable and inconsistent performance of precision voice coil actuator (VCA) fast steering mirror (FSM) in the control of high-precision application under wide temperature range, the temperature-segmented proportion-integration-differentiation (PID) adaptive control method was adopted. The working principle and temperature characteristics of the fast mirror were analyzed, after accessing the temperature sensor, temperature-segmented PID control parameter table was obtained by parameter identification. The experimental environment was built for step and bandwidth testing. The results show that, in the wide temperature range from −40 ℃ to 60 ℃, the temperature-segmented PID adaptive control method improves the system step time by more than 27%, and the bandwidth is improved by more than 40% in the high temperature environment compared with ordinary PID. This method can effectively improve the step response and bandwidth capability of the FSM in a wide temperature domain, which provides a reference for the stability and consistency control of the FSM in a wide temperature domain.