Compressed-air　vehicles　have　the　advantages　of　zero　pollution　and　low　cost.　A　compressed-air　engine　test　bench　is　established　in　this　study.　The　effects　of　rotational　speed,　torque,　and　regulated　pressure　on　the　power　performance,　economy,　and　energy　conversion　efficiency　of　the　pneumatic　motor　are　investigated.　The　differences　in　power　output,　compressed-air　consumption　rate,　and　energy　conversion　efficiency　between　forward　and　reverse　rotation　of　the　pneumatic　motor　are　compared　and　analyzed.　To　effectively　investigate　the　performance　of　a　compressed-air　vehicle　under　various　road　conditions,　this　study　compares　and　analyzes　the　power　performance,　economy,　and　energy　conversion　efficiency　of　pneumatic　motors　under　different　road　conditions.　Experimental　results　show　that　the　power　output　and　energy　conversion　efficiency　of　the　pneumatic　motor　in　reverse　rotation　are　less　than　those　in　forward　rotation,　indicating　that　the　pneumatic　motor　has　better　power　performance　and　higher　efficiency　with　forward　rotation　than　reverse　rotation.　The　compressed-air　consumption　rate　of　the　pneumatic　motor　with　reverse　rotation　is　higher　than　that　with　forward　rotation,　indicating　that　the　pneumatic　motor　with　forward　rotation　has　better　economic　performance　than　with　reverse　rotation.　The　maximum　power　output　and　energy　conversion　efficiency　of　the　pneumatic　motor　are　about　1220　W　and　13.23%,　respectively.