Project Introduction: Compressed Air Energy Storage (CAES) systems are one of the important technologies for achieving peak shaving and valley filling in electricity use, as well as efficient utilization of unstable wind/solar energy. The project addresses the shortcomings of low efficiency under variable working conditions for compressors and expanders, and large system throttling losses from a process improvement perspective; it also enhances energy utilization efficiency from the perspective of coupling heat, cold, and electricity. Innovation Points: 1. A single energy storage system achieves combined supply of heat, cold, and electricity 2. Ejectors improve the performance of the energy storage system Prospects: Policy support; ejectors enhance energy storage performance by >2%; the system's multi-energy co-supply efficiency can reach 1.7; there is good technical development potential with broad application prospects;