In　this　paper,　a　free　piston　expander-linear　generator　(FPE-LG)　experiment　rig　equipped　with　different　linear　generator　(LG)　is　established.　A　comparison　study　on　the　performance　of　FPE-LG　with　different　LGs　is　conducted.　Then　the　operation　characteristics　and　output　characteristics　of　FPE-LG　are　investigated.　The　results　show　that　the　selection　and　design　of　LG　has　significant　influence　on　FPE-LG　performance.　The　displacement　and　velocity　with　LG-1　are　higher　than　that　LG-2＇s,　but　the　operation　stability　and　output　performance　with　LG-2＇s　are　better.　Considering　the　high　pressure　and　temperature　operation　conditions　in　ORC　system,　LG-2　is　suitable　for　this　experiment　rig.　Both　actual　stroke　and　velocity　increase　with　intake　pressure　and　external　load　resistance.　The　variations　of　actual　stroke,　velocity,　indicated　efficiency,　voltage　and　power　output　are　more　sensitive　to　intake　pressure　than　external　load　resistance.　The　maximum　power　output　can　reach　up　to　111　W.　The　voltage　output　is　in　agreement　with　that　of　velocity.　The　peak　voltage　output　is　usually　obtained　when　the　velocity　reaches　peak　value.　The　energy　conversion　efficiency　shows　first　increases　and　then　decreases　with　external　load　resistance　and　intake　pressure.　The　maximum　energy　conversion　efficiency　of　74%　can　be　obtained.　(C)　2018　Elsevier　Ltd.　All　rights　reserved.