Tianhai bentonite waterproof blanket (GCL) is earthworkcomposite material that is specially used for anti-seepage ofman-made lake waterscape, landfill yard, underground garage,building roof garden, water tank, oil depot and chemical pile yard.GCL is blanket shape fabric that is produced by filling sodium basebentonite with high expansion between special composite earthworkcloth and non-woven cloth and locking bentonite on lower compositefabric through upper non-woven cloth fabric by special needleembroidering method. Bentonite anti-seepage liner produced byneedle embroidering method can form many small fiber spaces, whichprevent bentonite particles from moving in one direction, rubberhead water layer with uniform high density is formed in the linerwhen meeting water so as to prevent water seepage effectively. GCLis anti-seepage liner between CCL (site tamping clay anti-seepageliner) and macromolecule material earthwork film. It is mainly usedin various environmental protection projects such as waste landfillyard, underground reservoir and underground infrastructure, solvessealing, isolation and anti-seepage problems, and has good effectand strong damage resistance.