The increase of working temperature of fiber-optic gyroscope (FOG) is mainly limited by the optical path system, which can be improved by optimizing the control scheme. Through the theoretical analysis of FOG optical system, the FOG control scheme based on dynamic temperature control was proposed. The improved effect of the was verified by experiments. On the one hand, the dynamic temperature control scheme of FOG can reduce the power consumption at high temperature and improve the high-temperature working temperature. On the other hand, it can reduce the change of FOG scale factor caused by the temperature fluctuations.