Abstract: A damp-proof construction for building underground or subways includes damp-proof bricks formed of plastics are disposed on an underground base surface and adjacent an outer wall with spaces for drainage therebetween. An inner wall of cement bricks may be mounted on the damp-proof bricks. After the inner wall is fabricated, plastic palettes are mounted on the underground base surface. Non-woven fabrics may be layered on the plastic palette layer. A mortar or concrete as an upper protecting layer may be layered on the non-woven fabric layer. The damp-proof construction prevents moisture from entering building construction through capillary action.