Properties of Ni47Ti44Nb9 alloy cold drawn wires and hot drawn wires were studied by means of the differential scanning calorimetry measurement and the tensile test. With increasing annealing temperature, the tensile strength and the yield strength decrease, while the elongation, the martensite transformation temperature and the transformation heat increase. The recovery strain keeps decreasing, and the transformation temperature, the transformation intervals increase with the increment of annealing temperature. Proper heat-mechanical treatment can promote the shape memory effect, and the recovery strain of 40% cold drawn wire is better than that of the hot drawn wires