Three-dimensional composite drainage net is a new type of geosynthetic material, the composite structure is a three-dimensional geomesh core, both sides are glued with needle-punched non-woven geotextiles. The three-dimensional geonet core consists of a thick vertical rib, and on diagonal rib at the top and one at the bottom, which can quickly discharge groundwater from the road. It also has a pore maintenance system that can block capillary under high loads. At the same time, it can also play role in isolation and foundation reinforcement.