The effect of different screw assemblies on the extruding process and mechanical properties of glass fiber reinforced styrene-acrylonitrile copolymer(AS) was studied,and a suitable type of screw assembly for reinforced AS was designed.The results showed that the proper screw assembly could improve the extruding process and upgrade the mechanical properties of the reinforced AS.By improving melting and shear effect of the screw assemblies,the tensile strength and flexural strength of glass fiber reinforced styrene-acrylonitrile copolymer were improved obviously,from 105MPa and 115MPa to 116MPa and 125MPa respectively.Moreover,it ensured the production of equipment.The quality of product met the requirements of home appliances manufacturing enterprises at home and abroad.