The production line using a variety of resins such HDPE, LLDPE, MDPE resin etc.(New materials & recycled materials are available) as raw materials, and adopts casting extrusion and vacuum plastic absorption process through concave and convex roller to produce single color / double color drainage sheet,Its shape is a circular cone, cylindrical, spherical shell with three-dimensional space and a certain support solidity. Liquids and gases can flow in it to achieve the effect of preventing and draining water.