Solid wall pipe is an extrusion molding communication optical fiber protective casing which is produced by polyethylene (it can produce two different qualities of high density and low density polyethylene) as raw materials. The product has a high performance of bending property, smooth inner and outer wall. It is easy to get free extraction in the corrugated pipe. The tube is penetrated by the optical (electric) cable, which has a good sealing performance, waterproof, anti-aging, corrosion resistance, and long service life. It is designed by various colors and identifiable. It can be random bent according to the characters of terrain and head up and down, flexible threading and widely used in Mobile, Telecom, network and other underground communication constructions.