This　paper　presented　a　new　free　piston　expander-linear　generator　(FPE-LG)　for　small-scale　organic　Rankine　cycle　(ORC)　waste　heat　recovery　system.　A　FPE-LG　experimental　test　rig　was　developed　and　a　simulation　model　based　on　Matlab/Simulink　was　established.　The　simulation　model　was　validated　with　respect　to　the　experimental　results　at　relatively　high　intake　pressure　and　operating　frequency.　Further　investigation　on　the　motion　characteristics　and　output　performance　of　FPE-LG　were　conducted　with　relatively　high　intake　pressure　and　operating　frequency　based　on　the　simulation　model.　The　results　show　that　the　intake　pressure　and　operating　frequency　have　a　great　effect　on　the　motion　characteristics　and　output　performance.　The　peak　power　output　is　676W　when　the　intake　pressure,　external　load　resistance,　and　operating　frequency　are　10bar,　9Ω　and　15Hz,　respectively.　©　2018　Chin.　Soc.　for　Elec.　Eng.