Abstract: Based on the conventional external spinning process,the spinning ring is used as the deformation tool for the purposes of large-tightness internal contact between the spinning ring and the work-piece,increasing the momentary radial spinning rolling force,and enhancing the rolling permeability of the spinning-rolling stress,and meanwhile reducing the radial strain speed of the blank metal,optimizing the circumferential and radial deformation behaviors of the blank metal so as to finally get the high-strength light-wall metallic pipe fitting.The simulation result reveals that during the spinning process with the internal spinning ring,the uniform deformation of the metal along the wall thickness direction can obviously enhance both the radial and circumferential deformation abilities of the metal.