Abundantfluid-meltinclusionsarefoundintheaegirine-augite-baritepegmatiteandcarbonatiteveinsintheMianningREEdeposit,Sichuan,Theyweretrappedinearlystagefluoriteandquartzfromasalt-meltsystemattemperatureshigherthan5000℃,Meanwhile,fluidinclusionsarealsopresentinalrgeamountsinbastnaesite.Homogenizedbetween150and270℃,theseinclusionsarethoughttoberepresentativeofthephysico-chemicalconditionsofREEmineralization.TheseresultsshowthattheMianningREEdepositisoftypicalhydrothermalorigindevelopedfromasalt-meltsystem.