The Fuzzy Comprehensive Benefit Evaluation On Minqin Country's Water-saving Agriculture

China is one of the most scarce water countries in the world. Water resourse has been bottle-neck to restrict the development of economy and society. The development of agriculture needs a great deal of water, so to solve the use of water is a key problem to both agriculture development and other trades. That is to say, the development of water-saving agriculture system has significance to relax the supply-need contradietion of water resourse, as well as to the development of economy and society in China.Minqin Oasis locates lower reaches of Shiyang River in the east of Gansu Corridor of Gansu Province, China. It is surrounded by Badanjilin Desert and Tenggeli Desert from east, west and north. And it is the region in which the contradiction of use-water standes out mostly, entironment is most execrable, and water resource is the most restriction factor to the agriculture development in Shiyang River drainage area.Based on the analysis of water-saving agriculture development at home and abroad, this paper launches research on Mingqin country's water-saving agriculture, establishes an adaptive assessment index system of Mingqin country, then to evaluate comprehensive benefit of Mingqin country's water-saving agriculture. The result shows that the economic efficiency changes is fluctuated, but increased as a whole; however, the ecological and social benefits present as an increasing tendency, and increased steadily. Water-saving agriculture is facilitate to ecology, economy and social benefits. The comprehensive benefits has been influenced by ecology benefits, economy benefits and social benefits, and presents as a clear upward trend. This paper confirms water-saving agriculture model's facilitation to Mingqin country's ecology,economy and society. Finally this paper discusses some problems that are negative to the development of ecology, economy and social benefits, and finally make some suggestions to the peoblem.a) Although there have been some fluctuations in the economic benefits of the water-saving agriculture in Minqin county, they are still on an upward trend in overall. In addition, there also has an upward trend in the ecological and social benefits and is increasing slowly and gradually. With the influence of the three growing benefits, the Comprehensive benefits show a raising trend. In the comprehensive analysis point of view, the economic benefits have declined, as the overall trend is positive, they have little influence in the development of economy and play a catalytic role. The Water-saving agriculture is quite suitable for Minqin and the application of these models is in favor of the growth of comprehensive benefitsb) Based on the analysis in the evaluation dates of comprehensive benefits of water-saving agriculture of Minqin, we may safely draw a conclusion that the investment and the policy guidance of water-saving agriculture project played a decisive role in the development of water-saving agriculture in Minqin, but the ecological, economic and social benefits are growing slowing. The main problems are the water-saving agriculture system is imperfect, only improved irrigation efficiency to a certain extent and ease the contradiction between water supply and demand, but irrigation efficiency is low and irrigation techniques are backward compared with developed areas; the total amount of water is insufficient to meet the economic development of the agricultural; the agronomic water saving measures need to be accelerated, there is still a certain blindness to promote water saving technology.