The　organic　Rankine　cycle　is　one　of　the　most　promising　methods　for　converting　low　grade　heat　into　power.　However,　the　technology　of　small　scale　organic　Rankine　cycle　is　not　as　mature　as　that　of　large　scale　system.　One　of　the　limiting　factors　is　the　circulation　pump.　In　the　present　work,　a　simulative　organic　Rankine　cycle　condition　was　created　for　performance　testing　of　the　circulation　pump,　and　the　results　of　a　Roto-Jet　pump　were　obtained　for　different　rotational　speeds.　On　this　basis,　an　examination　of　small　scale　organic　Rankine　cycle　system　has　been　carried　out.　The　results　show　that　the　efficiency　of　the　pump　is　between　11%　and　23%.　Increasing　the　rotational　speed　of　the　pump　or　reducing　the　flow　rate　leads　to　a　general　decrease　of　pump　efficiency　in　the　parametric　ranges　under　study.　It　is　also　found　that　the　pump　is　suitable　for　the　small　scale　organic　Rankine　cycle　systems　with　evaporating　temperature　between　99.5　degrees　C　and　127　degrees　C,　and　the　organic　Rankine　cycle　system　is　suitable　for　converting　the　heat　with　available　thermal　power　between　66.2　kW　and　92.7　kW　into　power.　In　addition,　the　optimal　operation　points　were　found　to　correspond　to　highest　organic　Rankine　cycle　efficiency　for　different　rotational　speeds　of　the　pump.　Based　on　the　results　of　optimal　operation　points,　the　strategy　of　adjusting　the　pump　rotation　speed　and　the　effects　of　superheat　were　investigated.　(C)　2015　Elsevier　Ltd.　All　rights　reserved.