Silicon core pipe is a new kind of composite pipe with silicone solid lubricant in inner wall. It has good sealing performance, anti-corrosion, low construction cost, and it is widely used in optical cable communication network system of highway, railway etc. HDPE silicon core pipe, in short, silicon pipe, is extruded and composited by three sets plastic extruding machines synchronously and its main materials are high-density polyethylene;.and core layer is solid lubricant silicone with the lowest friction coefficient. They are extensively applied in optical cable communication network systems.