In　this　study　the　modification　effect　of　Hf　content　on　the　shape　memory　properties　and　magnetic　permeability　of　a　75.5-77Ti-20Ta-3-4.5Hf　alloy　system　has　been　systematically　studied　by　DSC,　three-point　bend　test,　vector　network　analyzer　and　XRD.　The　martensitic　transformation　temperature,　heat　of　reaction　and　recovery　strain　increases　with　the　increase　of　hafnium　and　tantalum　content.　A　stable　high　temperature　shape　memory　effect　was　observed　(Ms　=　385-390　degrees　C)　during　the　two　thermal　cycles　between　20　degrees　C　and　725　degrees　C.　Transformation　temperatures　and　heats　of　reaction　were　determined　by　DSC　measurements.　Recovery　strain　was　determined　by　three-point　bend　testing.　Also　an　alloy,　70Ti-26Ta-4Hf,　with　higher　tantalum　content　was　produced　to　observe　the　effect　of　Ta　on　the　shape　memory　properties.　Permeability　increases　gradually　from　1.671　to　1.919　with　increasing　content　of　hafnium　modification　and　remains　stable　in　the　frequency　range　of　450　MHz　to　1　GHz.