1. Constructional Engineering: clear water transportation, pressurization system, air condition water circulation system, fire extinguishing system, swimming pool and water circulation system. 2. Industry: circulating cooling system, process water for paper-making and paper pulp, steel production, shipbuilding, sea transportation and other manufacturing industry. 3. Mining Industry: water supply, mine drainage, generating station, etc. 4. Others: Municipal water supply, marine drainage,agricultural irrigation and some others.