Abstract:

According to the literature research and data collection，the evaluation model of the decoupling potentiality is given，to analyze the decoupling trend of economic development and water environment pressure of water conservancy stages during 1986-2010，based on the IPAT model and elastic analysis method.The results show that the decoupling trend of economic development and wastewater total amount was weak generally，which was weak in the Seventh Five Year Plan period and Eight Five Year Plan period.Although the decoupling trend of economic development and wastewater total amount was weak in the Nine Five Year Plan period，the decoupling trend was not obvious.The wastewater discharge amount was further increased in the Ten Five Year Plan period and Eleven Five Year Plan period.It means that the wastewater discharge amount was not controlled strictly，and kept in the sustainable growth.The decoupling trend of economic development and COD of industrial wastewater experienced the process of “strong decouplingweak decouplingstrong decoupling”.The decoupling trend of economic development and COD of industrial wastewater was strong in the Seventh Five Year Plan period.Although the decoupling trend of economic development and COD of industrial wastewater was weak in the Eight Five Year Plan period，the decoupling trend of economic development and COD of industrial wastewater was strong in the Nine Five Year Plan period，Ten Five Year Plan period and Eleven Five Year Plan period.Generally，the decoupling trend of economic development and COD of industrial wastewater was strong，accorded with the situation of industrial modernization at present.In the process of economic development，the COD of industrial wastewater was declined，but the COD of cities and countries wastewater and COD of countries breeding industry was increased.Then，according to the changing trend of Kuznets curve of water environment，the wastewater total amount forecasting of general development with Kuznets curve model was given，the results of wastewater total amount was modified combined with country develop program，and the feasibility analysis of the decoupling of water environment pressure was given from the angles of socpolicy and ecotechnology.The decoupling trend of economic development and water environment pressure is strong absolutely in 2020，to improve and purify water environment