Superelastic behavior and deformation process of a near beta Ti-3Zr-2Sn-3Mo-25Nb alloy sheet under the different heat treatments were investigated. The results show that the alloy has a certain surperelasciticy at solution treatment and aging treatment, especially the superelasciticy of the alloy is the best at solution treatment above the phase transition temperature, and now the maximum volume fiction of the stress induced martensite is observed. But both the precipitated ω phase and the fine α phase after solution treatment and aging treatment hinder the formation of the stress induced martensite, make the elasticity and the plasticity decrease. The studies also found that the proper predeformation on the sheets could improve superelasticity.