The concept of 304 stainless steel superplasticity realized by deformation induced martensitic phase transformation was put forward. The method of the superplasticity realized by using the deformation induced martensite phase transformation cycle was studied. The results show that 304 stainless steel through room temperature deformation can induce martensitic phase transformation. During subsequent aging, inverse phase transformation of martensite occurs, and the recovery stress accompanies, which indirectl...