Adiabatic　compressed　air　energy　storage　provides　a　promising　solution　for　matching　intermittent　sources　of　renewable　energy　with　customer　demand　during　the　daily　cycle.　In　this　work,　a　novel　thermal　energy　storage　strategy　—　using　multiple　phase　change　materials　—　are　proposed　to　achieve　less　thermal　energy　loss　in　an　adiabatic　compressed　air　energy　storage　system,　and　the　thermal　energy　storage　performance　of　this　type　of　thermal　accumulators　is　discussed　in　detail　by　constructing　the　off-design　thermodynamic　mathematic　model.　The　obtained　results　indicate　that,　compared　with　single-phase　change　material,　a　smaller　amount　of　thermal　energy　loss　appears　while　using　multiple　phase　change　materials　stores　compressed　heat.　Besides,　in　the　initial　cycles,　there　is　still　considerable　residual　heat　remaining　in　the　proposed　thermal　accumulator,　however　this　will　gradually　fade　away　after　4　cycles,　resulting　in　the　thermal　energy　storage　efficiency　increases　to　91.5%.　It　is　confirmed　that　the　round-trip　efficiency　increases　by　4.7%　if　a　thermal　accumulator　with　multiple　phase　change　materials　was　used　for　a　conventional　compressed　air　energy　storage　plant　—　Huntorf.　©　2020