Compressed　air　energy　storage　will　have　good　development　prospects　because　of　its　exceptional　safety　and　reliability,　low　economic　cost,　zero　carbon　emissions,　and　pollution-free　environmentally　friendly　characteristics,　which　meet　the　needs　of　sustainable　and　green　development.　In　view　of　the　problems　of　large　volume,　great　number　of　equipment,　and　poor　flexibility　of　traditional　compressed　air　energy　storage　equipment,　this　article　built　a　compressed　air　experimental　bench　based　on　pneumatic　motor　and　conducted　integrated　pneumatic　motor　compression/expansion　experiments.　The　effects　of　key　parameters　such　as　speed,　torque　and　current　on　the　performance　of　pneumatic　motor　under　different　modes　are　investigated,　providing　reference　for　the　application　and　promotion　of　small　compressed　air　energy　storage　systems.　The　results　indicate　that　in　the　expansion　mode　of　the　pneumatic　motor,　the　total　efficiency　and　power　output　of　the　motor　can　reach　up　to　14.01　%　and　1257.87　W.　Its　high　power　output　and　economic　operation　are　concentrated　within　the　medium　range　of　rotation　speed　and　current,　respectively,　with　a　certain　cooling　effect　achieved　in　this　mode.　In　compression　mode,　the　maximum　output　power　of　the　motor　can　reach　3696.33　W,　while　the　energy　efficiency　is　up　to　78.39　%.　The　operating　parameters　such　as　torque　and　current　are　basically　positively　correlated　with　the　system　performance　parameters.　The　integrated　system　is　flexible,　saves　space,　and　has　certain　feasibility.