The compressed air energy storage is a large-scale physical energy storage technology and a highly promising new type of energy storage technology. This paper summarizes the basic principles of isothermal compressed air energy storage

and introduces the principles and current development status of key equipment and related technologies. It provides an analysis and summary of liquid pistons

pumps and turbines. Moreover

it reviews the basic principles of isothermal compressed air energy storage

and analyzes the existing research progress on isothermal compressed air energy storage technology. An analysis and summary are presented for liquid piston technology

as well as pump and turbine technology in the system. The data of existing compressed air energy storage power stations are summarized and analyzed. The data of existing compressed air energy storage power stations are summarized and analyzed. On this basis

the future development direction of isothermal compressed air energy storage technology is prospected

which provides a certain data reference for the selection of power equipment in isothermal compressed air energy storage system and the promotion of demonstration projects.