A coupled thermal-mechanical model of the rotary swaging of pure magnesium was developed using the general finite-element software program MSC/Marc to visualize the effect of axial feeding velocity on the rotary swaging process. The radial displacement occurring in one pulse impact increases in proportion to axial feeding velocity (vax). When the other processing parameters are fixed, the surface roughness of the swaged bar increases with vax and is in parabolic relation with vax. There exists a minimum velocity vax, min below which the decrease of vax will no longer improve the surface roughness. Under the technological conditions of this simulation, when the finial diameter d=6.6 mm, vax, min=1.82 m/min, and when d=7.0 mm, vax, =1.83 m/min. If min Ra=3.2 is required for the end product, then vax, =6.02 m/min is gotten for d=6.6 mm and vax, max max =7.05 m/min for d=7.0mm. The increase of vax has no notable influence on strain distribution along radial direction. The errors between the experimental and simulated height of the spiral spine-like ridges are below 8.0%. A coupled thermal-mechanical model of the rotary swaging of pure magnesium was developed using the general finite-element software program MSC / Marc to visualize the effect of axial feeding velocity on the rotary swaging process. The radial displacement occurring in one pulse impact increases in When the other processing parameters are fixed, the surface roughness of the swaged bar increases with vax and is in parabolic relation with vax. There exists a minimum velocity vax, min below which the decrease of vax will Under the technological conditions of this simulation, when the finial diameter d = 6.6 mm, vax, min = 1.82 m / min, and when d = 7.0 mm, vax, = 1.83 m / min. Ra = 3.2 is required for the end product, then vax, = 6.02 m / min is gotten for d = 6.6 mm and vax, max max = 7.05 m / min for d = 7.0 mm. The increase of vax has no not influence on strain distribution along radial direction. The errors between th e experimental and simulated height of the spiral spine-like ridges are below 8.0%.