Abstract: In this paper, aiming at the integrated energy system of electric-thermal coordination, combined with the respective characteristics of electric energy storage and thermal energy storage, a control strategy of fluctuating power stabilization is designed. The strategy takes into account the fluctuating power of the system and the SOEC and SOC of the energy storage unit, and establishes the basic principles of power stabilization. According to these principles, the running state of the system is divided into eight working modes to effectively control the fluctuating power. The simulation results show that the proposed strategy can effectively stabilize the power output of the system in a variety of fluctuation scenarios, avoid the performance degradation of the energy storage unit caused by overcharging or over discharge, and ensure the safe and stable operation of the electric-thermal integrated energy system.