Function: ■ Geotextile has good air and water permeability to let water flow through it so as to effectively control sandrock running-down. ■ Geotextile has good water transmissibility, it can form drainage channels inside soil mass to drain redundant liquid and air out of the soil mass. ■ Geotextile helps to enhance the soil mass’ tensile strength and non-deformability and structural stability so as to improve soil mass quality. ■ It can effectively make the concentrated stress diffuse, transfer or decompound, and prevent the soil mass against the destruction of outside force. ■ It can prevent the mixture of sandstone, soil mass and concrete of upper and lower layers. ■ Its mesh is hard to jam by virtue of the compliancy and motility of the reticulation formed by indefinite form fibrous tissue. ■ High water permeability-it can keep good water permeability even in the pressure of soil and water. ■ Corrosion resistant-it is made from polypropylene fiber or terylene or other chemical fiber, featuring resistance to acid and alkali and oxidation, non-corroding, no worm-eaten. ■ Easy construction-low weight, easy operation, simple construction.