Surface of porous NiTi alloys was modified by direct current-pulse anodic oxidation technology at low temperature. The process of direct current-pulse anodic oxidation was analyzed. The phase composition, morphology and anti-corrosion behavior of the anodic oxidation film were studied by XPS, SEM and potentiodynamic polarization, respectively. The Ni release of porous NiTi alloys before and after anodic oxidation was investigated in simulated body fluid. The results show a uniform porous oxidation film with a thickness of about 190 nm on the surface of the porous NiTi alloy was obtained after anodic oxidation at direct current of 3 A and pulse current of 6 A. The oxidation film was mainly composed of the oxides of Ti. The corrosion resistance of porous NiTi alloys was obviously improved and the rate of Ni release was significantly reduced after anodic oxidation.