An　applicable　and　reliable　FE　model　for　the　extrusion　assembly　process　for　GEW12DEM1T　spherical　plain　bearings　was　developed　under　the　ABAQUS　software　environment.　And　the　effects　of　forming　parameters,　viz.,　die　radius　R1,　R2,　convergent　radius　Ra,　sizing　belt　length　h,　ram　speed　v,　on　the　peak　contact　pressure　of　billet　Fmax,　the　peak　extrusion　load　of　billet　Lmax,　the　peak　difference　between　the　maximum　clearance　and　minimum　clearance　Mmax　and　the　uniformity　of　flow　rate　at　die　export　SDV　were　investigated　using　virtual　orthogonal　experiment　based　on　the　developed　FE　model.　The　results　show　that　the　order　of　the　forming　parameters＇　significance　on　Fmax,　Lmax,　Mmax　and　SDV　are　Ra>h>R1>R2>v,　Ra>h>v>R1>R2,　Ra>h>v>R1>R2　and　v>R2>h>Ra>R1,　respectively.　Comprehensively　considering　the　quality　of　the　spherical　plain　bearings　and　the　extrusion　load,　we　pointed　out　that　the　reasonable　ranges　of　the　forming　parameters　are　as　follows:　R2=17　mm~30　mm,　R1=4.5　mm~5　mm,　h=6　mm~6.3　mm,　v=20　mm/s~40　mm/s,　Ra=13.9　mm~14.2　mm.　The　verifying　experiment　shows　that　the　results　of　the　numerical　simulation　and　the　virtual　orthogonal　experiments　were　accurate　and　effectual.　©,　2014,　Beijing　Res.　Inst.　of　Mechanical　and　Elec.　Technology.　All　right　reserved.