Composites (WPC) is a new type of composite material which is developing vigorously at home and abroad in recent years. It means that polyethylene, polypropylene and polyvinyl chloride are used to replace the usual resin adhesives, and mixed with more than 50% of waste plant fibers such as wood flour, rice husk and straw to form new wood materials, and then made into plates or profiles through plastic processing technologies such as extrusion, molding and injection molding. Mainly used in building materials, furniture, logistics and packaging industries. Extruded wood-plastic composite board is formed by hot extrusion after mixing plastic and wood powder in a certain proportion.