Abstract: Compressed air energy storage is a large-scale energy storage with higher feasibility to realize the deep peak shaving of thermal power units and the large capacity energy storage demand of the power grid. This article proposes an adiabatic liquid compressed air energy storage system and studies the key parameters within the system. Build a physical system model and theoretical calculation model, and perform theoretical calculations on key parameters such as compressor unit interstage temperature, compression ratio, and turbine interstage temperature, while comparing the performance with adiabatic compressed air system. Research shows that under the condition of energy storage pressure level of 8.1MPa and flow rate of 15500kg/h, the optimal temperature between stages of the compressor unit is 65 ℃, and the optimal compression ratio is 3; Under the same conditions, the energy storage efficiency of liquid compressed air system is 10% higher than that of adiabatic gas compressed air system in terms of electricity electricity conversion efficiency. In terms of energy storage density, liquid energy storage density is 4.7 times that of gas energy storage density. In the volume of the gas storage chamber: Liquid compressed air only accounts for 1/10 of the adiabatic gaseous compressed air energy storage.