The Min River is a large tributary in the upper reaches of the Yangtze River. Its source is the south range of the Min Mountains in the area where Sichuan and Gansu share a bounda￣ry. The area consists of five counties in the Aba Tibetan-Qiang Autonomous Prefecture, including Wenchuan, Lixian, Maoxian, Songpan, and He￣ishui. The area covers 25,426 square kilometers. The area in the upper reaches of the Min River is an arid valley, and its ecological position is very important. This area is not only one that is home to world heritage and national scenic spots, but it is also a poor ethnic minority area with relatively backward economic conditions. Moreover,it is also an important ecological screen and water source for the Chengdu plain,as well as an important part of the ecological protective screen in the upper rea￣ches of the Yangtze River. As a result of natural disasters,pressure on the carrying capacity of the population and the careless manner of economic development,the resources and environment in this area have been exploited irrationally. This has cre￣ated a series of serious environmental problems,in￣cluding environmental pollution, and depletion of resources,etc. Therefore, constructing an ecologi￣cal protective screen in the upper reaches of the Min River becomes very important.