In an attempt to optimize the shape recovery temperature, the effect of Zr addition on phase constitution and heat treatment behavior is investigated by electrical resistivity and Vickers hardness (HV) measurements, X-ray diffractornetry (XRD) and shape recovery tests. Ti-25mass%Nb-0, 2, 7 and 12mass%Zr alloys (abbreviated as 0Zr, 2Zr, 7Zr and 12Zr, respectively) were prepared using an arc-furnace. Specimens were solution-treated at 1273 K for 3.6 ks and then quenched by iced water (STQ). STQed specimens were isochronally heat-treated. In 0Zr and 2Zr, only the orthorhombic martensite phase alpha" was identified by XRD, while the two-phase alloys alpha" and beta were identified in 7Zr and 12Zr. In 7Zr, resistivity at liquid nitrogen and room temperature (rho(LN) and rho(RT), respectively) and resistivity ratio (rho(LN)/rho(RT)) drastically increased at 523 K because of the reverse-transformation of alpha" into beta phase. Thereafter, resistivity and resistivity ratio decreased with increasing heat treatment temperature due to isothermal omega precipitation. Starting temperature of shape recovery is 623 K in 7Zr and 523 K in 12Zr. In 7Zr, shape recovery ratio is about 80% at 723 K, which is the maximum obtained in this study.