The composite material with closed cell cross-linked foam surface has high impact resistance, can withstand high pressure for a long time, and has no deformation at all. The product integrates drainage system and waterproof system, completely solves the relationship between drainage and waterproof. Both drainage and commercial use are more reliable than traditional stone drainage and additional filter plates. Waterproof and drainage is a necessary link in construction. Solid and reliable, which is a test of the building waterproof and drainage system.