DEFORM-3Dsoftware was used to simulate the equal channel angular pressing（ECAP）of different cross-section workpieces.The distribution of strain and damage factor during the deformation process of the EACP with circular cross-section and square cross-section were analyzed

which provided a reference for the actual experiment of canned-ECAP of AZ31 magnesium alloy.The results show that distribution of equivalent strain is similar at different sections

and the equivalent strain distribution at the vertical direction exhibits more uniform.In extrusion process

the circular cross-section specimen is completely in the compressive stress state

while the tensile stress of the square cross-section specimen in the shear deformation zone will cause the cladding to crack

and the internal blanks will initiate crack or even fracture.Compared with square cross-section specimens

damage factor of circular cross-section is very small.AZ31 magnesium alloy cladding ECAP workpiece cross-section is set to circular cross-section.