Abstract: Spray of polyurea elastomer(SPUA) is anewly developed and healthy technology of water proofing without resolvent and pollution. This paper describes the sorts and the properties of SPUA, polymer equipments and construction skills. Experience of spray technology of SPUA on large area and high lift is achieved. It is foreseen that it has abright future applying the spray technology of SPUA in solving the problems of Abrasion resistant, resistant seepage and antiseptic of hydraulics projects.