One step way is arranging the raw materials directly into a group of equipments, which is formed successively by mixing and extruding instead of eliminating the middle granulation of this link. The advantage of this way is of high efficiency, better quality of mixing plastics, significant energy saving, and lower production costs. At present, with more usage in PVC class of the extrusion plastic-wood products, the higher requirement on raw materials, feeding devices, supporting moulds, extrusion equipment as well as the overall staff technological level.