Plastic drainage boards are made by molding a plastic base plate, made from polystyrene (HIPS) or high-density polyethylene (HDPE), into conical ridges or reinforced ribs (or hollow cylindrical porous) through stamping. Through continuous innovation and research, the material has been greatly enhanced and transformed. Now, it is pressed using (material), significantly improving compressive strength and overall flatness. The width ranges from 1 to 3 meters, and the length is 4 to 10 meters or more.