A　nanocrystalline　Ni-49.8　at%Ti　alloy　with　an　average　grain　size　of　about　16　am　was　acquired　by　cold-drawing　and　low-temperature　annealing.　The　stability　of　stress-induced　martensite　of　the　nanocrystalline　NiTi　alloy　was　investigated　by　a　differential　scanning　calorimeter　(DSC).　The　results　show　that　stress-induced　B19＇　martensite　was　preserved　when　the　samples　were　subjected　to　14%　and　16%　prestrain.　The　DSC　measurements　reveal　that　the　prestrained　samples　experience　two-stage　B19＇　-＞　B2　transformation　upon　the　first　heating　process　and　the　transformation　temperature　increases　with　an　increasing　prestrain.　(C)　2014　Elsevier　B.V.　All　rights　reserved.