In　this　paper?a　experimental　system　of　solar　powered　thermoacoustic　engine　has　been　designed　and　set　up,　which　consists　of　two　major　components(a　dual-axis　automatic　tracking　Fresnel　lens-focusing　collector　and　a　small　standing　wave　thermoacoustic　engine).　Filling　in　different　pressure　nitrogen,　helium　and　argon　gas　respectively,　onset　temperature,　onseting　temperature　distribution　of　thermoacoustic　core　and　pressure　amplitude　of　solar　powered　thermoacoustic　engine　has　been　studied.　The　experimental　results　show　that　the　onset　temperature　of　He　is　highest　and　N2is　lowest　under　the　same　pressure.　When　the　injection　pressure　of　N2is　1.0　MPa,　the　system　reaches　the　lowest　onset　temperature　394.8°C,　and　at　the　same　temperature,　the　pressure　amplitude　of　N2keeps　constant　as　the　injection　pressure　increasing.　When　the　injection　pressure　of　Ar　is　1.0　MPa,　the　system　reaches　the　lowest　onset　temperature　418.2°C,　and　at　the　same　temperature,　the　pressure　amplitude　of　Ar　rises　as　the　injection　pressure　increasing.　These　results　provide　the　experimental　basis　for　optimizing　thermodynamic　performance　of　the　solar　powered　thermoacoustic　engine　system.