Cross wedge rolling process was used to roll steel core with warm rolling in order to study the forming process. According to the part forming characteristics, UG software was used to design molds for different cross wedge rolling process parameters, and Deform software was used to simulate forming process. The best process parameters were chosed and then equivalent stress and equivalent strain of radial section, equivalent stress and equivalent strain of axial section at different forming stages of the large arc of steel core were analyzed with the process parameters. Finally, products were rolled by experiment process. The result shows that forming angle, stretching angle and some other  process parameters have significant effects on appearance forming quality and inner forming quality of rolled piece. Using reasonable process parameters, cross wedge rolling process can produce qualified products with beautiful shape and defectfree inner. The equivalent stress and equivalent strain of rolled piece are consistent with a certain rule and the maximum value is in the reasonable range.