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In order to enhance the zero offset stability of auartz-flexibility accelerometer and ensure location accuracy of inertial navigation system, the auartz-flexibility accelerometer needs to work under a stable environment temperature. Thus, the temperature-control system design is fairly significant. Based on the specific requirements of temperature-control accuracy for a high-precision inertial navigation system, a temperature-control circuit was first designed with DSP circuit as the core controller. Then, a temperature-control model, which uses PWM as well as PID method, was built with the accelerometer assembly as the object. By MATLAB simulation and temperature-control algorithm developed in DSP circuit, the optimized parameters of the controller can be obtained. Finally, the working environment temperature of accelerometer can be stabled at 55±0.2 ℃. Experimental results verify that this kind of temperature-control design for auartz-flexibility accelerometer is able to offer high accuracy of temperature-control and fine stability. Thus, it can be applied in high-precision inertial navigation system.