The compound co-extrusion method is a profile formed by PVC fence and a layer of additional colored materials. The color material, whether PVC, polymethyl methacrylate or acrylic-styrene-acrylate copolymer (ASA), requires two main extruders (cone twin pupa rod 60 or 58 and single screw 30) to achieve. A composite die must be used to produce profiles. The production process is to extrude the profiles and colored materials from two different runners into the same flow lag before leaving the die. This method is characterized by the need for additional cold and hot mixer or dryer equipment in the production process, material recovery is difficult, complex production process, high cost and investment of composite film.