Magnetic　field　induced　martensitic　transformation　in　Fe-Mn-Ga　Heusler　alloys　has　been　discovered　by　W.　Zhu　et.　al　and　T.　Omori　et.　al　respectively　in　2009　[1,　2].　Thereafter,　very　few　works　concerned　about　this　alloy,　considering　its　great　potential　of　giant　shape　memory　strain,　large　exchange　bias　and　magnetocaloric　effect　[3].　One　obstacle　is　that　the　crystal　structure　transitions　of　this　material　are　tangled　together　with　martensitic　transformation,　and　thus　make　it　difficult　to　investigate　the　porperties　accurately.　Besides,　the　phase　stability　is　very　sensitive　to　the　variation　of　both　composition　and　heat　treatment.　To　simplify　the　problem,　melt　spinning　method　was　employed　in　this　work　to　obtain　Fe-Mn-Ga　phase　with　single　structure.　The　martensitic　transformation　is　completely　suppressed　and　thus　the　structure　evolution　and　the　mechanism　of　phase　transitions　could　been　investigated　separately.　©　2015　IEEE.