The water transfer from Yangtze River to Chaohu Lake is a comprehensive management measure to water environment of the lake,the water transfer route is one of the keys to the whole project planning.There are three routes of Fenghuangjin,Baidanghu and Caizihu for selection,the selection possesses complexity,fuzzy and uncertainty.Based on the fuzzy mathematics theory,the paper evaluated the transfer routes,established the evaluating index set,level set and index weight set,successively completed the first lev...