Externally bonded rubber waterstop, also known as back attached waterstop or external waterstop, is a water stop structure set outside the wallboard of concrete deformation joints and settlement joints of underground structures (upstream surface). It has the ability to adapt to the expansion and contraction deformation of concrete with the material elasticity and structural form of the waterstop. In addition, after the use of the externally bonded waterstop, backfill the outside of the concrete wallboard Attention should be paid to the protection of externally bonded waterstop.