Owing　to　their　shape　memory　effect　and　pseudoelasticity,　NiTi　shape　memory　alloys　(SMAs)　are　widely　used　as　functional　materials.　Mechanical　processes　particularly　influence　the　final　formation　of　the　product　owing　to　thermal　softening　and　work-hardening　effects.　Surface　integrity　is　an　intermediate　bridge　between　the　machining　parameter　and　performance　of　the　product.　In　this　study,　experiments　were　carried　out　on　turning　NiTi　SMAs　at　different　cutting　speeds,　where　surface　integrity　characteristics　were　analyzed.　The　results　show　that　a　higher　cutting　speed　of　125　m/min　is　required　to　turn　NiTi　SMAs　based　on　the　evaluation　of　surface　integrity.　The　degree　of　work　hardening　is　higher　at　15　m/min.　Consequently,　as　a　primary　effect,　work　hardening　appears　on　the　plastic　deformation　of　the　machined　samples,　leading　to　dislocations　and　defects.　As　the　cutting　speed　increases,　the　thermal　softening　effect　exceeds　work　hardening　and　creates　a　smoother　surface.　A　stress-induced　martensitic　transformation　is　considered　during　the　turning　process,　but　this　transformation　is　reversed　to　an　austenite　from　the　X-ray　diffraction　(XRD)　results.　According　to　the　differential　scanning　calorimetry　(DSC)　curves,　the　phase　state　and　phase　transformation　are　less　influenced　by　machining.　Subsequently,　the　functional　properties　of　NiTi-SMAs　are　less　affected　by　machining.