Drainage Net (DGN) is made of high-density polyethylene and processed by special extrusion molding process. It has a special structure of three layers and is a new type of drainage geotechnical material. In the transportation infrastructure such as railways and highways, the safety and service life of the project are inseparable from the drainage system of the project. Geosynthetic materials are an important part of the drainage system. The product has the characteristics of strong drainage, high tensile strength, corrosion resistance, acid and alkali resistance and long service life.