The Rubber dam has become a kind of new-type water conservancy project building as the development of macromolecule synthetic material industry.(Rubber dam) The dam tube is made of high strong synthetic fibers as its strength skeleton and synthetic rubber as its anti-abrasion layer. It has taken place of such construction material as the soil, stone, wood, steel, etc. which used from ancient time. In addition, it is an innovation of the construction material. (rubber dam)