The temperature performance is the main factor affecting the performance of fiber optic gyroscope. The structure of fiber optic gyroscope is optimized according to the different application environments. Through the design of thermal conductivity of materials, the temperature changes in the fiber ring are controlled, so as to improve the temperature stability of the fiber optic gyroscope. By using the finite element analysis method of ANSYS Workbench, the temperature simulation of the skeleton of the gyroscope is carried out, which can not only guide the structure design but also verify the effect of the structure design. Finally, the assembled highprecision fiber optic gyro prototype was tested and the zero bias stability reached 0.001 (°) /h without any temperature compensation.