In order to understand the stress and deformation characteristics of the structure of underground gas storage for compressed air energy storage(CAES),taking the under ground gas storage of a planned CAES plant in Suichang,ZhejiangProvince,as the research object,the stress and deformation characteristics and their variation process of sealing layer,lining and surrounding rock of gas storage under operating conditions were studied based on the thermodynamic coupling theory.There sults show that the heat exchange between the compressed air in the gas storage and the sealing layer causes the temperature of the sealing layer to rise greatly,while the temperature of the concrete lining and surrounding rock rises slightly under the condition of circulating inflation and deflation.Where the structure is close to the tunnel wall,the stress and displacement of the structure under high pressure is larger,but the stress and displacement decreases gradually with the increase of the distance from the tunnel wall surface.The stress and deformation of each structural layer are in the allowable range and the stability of the surrounding rock of the gas storage is good.The temperature,displacement and stress of each structural layer all show the periodic changing characteristics under the action of circulating pressure,and the closer the distance to the tunnel wall, the greater the changing amplitude.While the temperature and mechanical response of the surrounding rock far away from the tunnel wall show obvious hysteresis.