Unidirectional plastic geogrid of Shandong Tianhai is made by using high molecular polymer to be extruded and rolled to thin plate then regular mesh, and stretched vertically. The process enables the high molecule to be directional & linear conditions and uniformly distributed, with a long elliptic net-shaped integrated structure with high joint intensity. Such structure enjoys comparatively high tensile strength and modulus, especially the products of our company boasts high & early (extensibility between 2% and 5%) tensile strength and modulus at the international advanced level. The product provides ideal strength bearing and diffusion chain system with strong tensile strength (＞150Mpa), as the widely used reinforcement and consolidation material currently for a variety of soils.