Abstract: 1012 tensile twins were preseted in AZ31 magnesium alloy by corrugated wide limit alignment (CWLA)technology at room temperature, and the CWLA deformed sheets were annealed at 200 ℃for 3 h.The effects of deformation and subsequent annealing processes on the mechanical properties and microstructure of the Mg alloy sheet were investigated.It is found that1012tensile twins with grain boundaries fractions of about 21%appear in the Mg alloy sheet after CWLA at room temperature.The tensile strength of the deformed sheet reaches 260 MPa, which is much higher than that of the original plate.The plate changes from stronger basal texture to RD deflection texture.A large number of 1012tensile twins in the sheet after annealing at 200 ℃for 3 h are still retained, compared with those of the original sheet the plasticity and tensile strength of the sheet are significantly increased but the yield strength is reduced.