Abstract: The fiber coil is the core part of fiber-optic gyroscope, its stability and anti-interference ability directly influences the whole function of fiber-optic gyroscope. The temperature characteristic of fiber coil was investigated and the temperature gradient of each element in coil was determined by finite element analysis. According to the Shupe effect theory, we designed the analysis software on temperature characteristic for the fiber coil, the software combined the analytical result of finite element of the fiber coil with the output of fiber-optic gyroscope, which is the phase difference between the two directions of propagation light. We analyzed the temperature characteristic for the fiber coil based on different conditions such as different hot radiation methods, with or without the buffer layer, different winding methods and the asymmetry of the fiber coil.