Laser gyro is an ideal component of inertial navigation system, which has been successfully applied in land, sea, air and other fields. However, laser gyro is very sensitive to the temperature. When the external temperature changes, the two optical paths of laser gyro are asymmetric, which affects the accuracy of the output angular velocity. In this paper, the temperature field model of laser gyro is established by using the temperature simulation software Icepak, and the temperature distribution of two anode sides of laser gyro cavity is studied under the condition of non-uniform thermal boundary.The simulation results show that when the convective heat transfer coefficient increases by 3 times, the temperature difference between two anodes decreases by 50%. At the same time, the thermal resistance between the shell and the dither mechanism has a great influence on heat conduction, causing a temperature difference of 21%. Moreover, the anisotropic heat transfer material with a ratio coefficient of 1 000∶1 is attached on the surface of the cavity, and the uneven temperature zone will rapidly spread to other areas.The temperature uniformity measured by the two anodes is good. It provides some guidance for the design and engineering of temperature uniformity inside gyro.