Laser gyroscope cavity materials exhibit low thermal conductivity. When the ambient temperature changes, a thermal relaxation occurs when the external heat enters the cavity. In the gyroscope temperature cycling experiment, the parameters of the frequency stabilization control system are deviated from the ideal values owing to thermal relaxation, affecting the accuracy of the gyroscope. In this study, the finite element analysis method is used to simulate the temperature field distribution of the gyroscope from -40 ℃ to 70 ℃. According to the simulation results, the functions of the temperature difference between the inner and outer of the cavity and time is mathematically fitted. Based on the control characteristic of the prism laser gyroscope frequency stabilization servo system, the ideal control parameters of the frequency stabilization system under different temperature ranges are calculated. By the temperature-dependent digital frequency stabilization control in the prism laser gyroscope, the control parameters are changed in real time, and the experiments show an improved precision of gyroscope.