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Water is the source of life, the necessities of human survival. 21st century, along with economic prosperity, population continues to grow, the amount of available water resources is drastically reduced, coupled with the increasing pollution of the water environment becoming the economic and social development, risk factors that affect the health of the people. States will improve water ecological environment, to ensure the sustainable development of society mentioned important on the agenda, the hot water environmental safety evaluation of its security measures has become a global concern. Gansu Province is located in the northwest inland arid areas, economic development has been slow, with harsh natural conditions and lack of water resources, the ecological environment is extremely fragile. In recent years, with the accelerated process of urbanization in Gansu Province to water shortages and water pollution as the main feature of water security crisis, highlights the pressure. But for the safety of the province's water environment is still in the blank. After a systematic review of the origin of the water environment security, development, concept, connotation, at home and abroad on Water Environment Security Assessment content, methods and standards, commonly used in reference to the international community pressure - state - response model, based on specific The situation in the province, consists of three layers of 27 indicators, Gansu Province, the water environment safety evaluation index system. Comprehensive Application of Analytic Hierarchy Process, De Feier method and comprehensive index to evaluate the security situation of water environment in Gansu Province. The results show that: the water environment safety, Gansu Province, the change is not balanced, linear, and exhibit fluctuating characteristics. In 1999-2002 water environment in Gansu Province, the security situation in the \In 2003-2008, the water environment security is the next level, the safe value increased year by year. Water environment subsystems affect the water environment in Gansu Province, the safety of vulnerable systems. Effective irrigation area accounted for the proportion of arable land arable land floods and droughts affected area, per unit of GDP energy consumption indicators, the rate of soil erosion control, industrial wastewater discharge compliance rate of urban sewage treatment rate, the average annual rainfall factor Gansu Province Water Environment security constraints. A systematic analysis of the water environment security situation in Gansu Province over the past decade, the reference to the gray prediction theory, the use of GM (1,1) model for the original time series data 1999-2008 water safety, accuracy , tested and qualified model, Gansu Province 2009-2018 water environment safety trend is predicted. The results show that the three system safety and safety in the next decade will be an upward trend was a negative impact on the water environment comprehensive safety, ecological environment system presents a positive impact on the consolidated degrees. Finally, the existing problems, combined with the water environment in Gansu Province security status and trends of predictive value, and puts forward a number of suggestions to improve the water environment safety levels in Gansu Province, to provide a scientific basis for promoting ecological civilization construction in Gansu Province.
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