Abstract:Urban eco-environmental water requirements (UEEWR) is an interdisciplinary field of urban water resources and urban ecosystem. The theory and methodology put forward in the previous section have been applied to the study of the Yellow River Basin in this continued one. A total of 45 cities in the Yellow River Basin are chosen and classified into five categories through the fuzzy comprehensive evaluation. They include urban categoriesⅠ,Ⅱ,Ⅲ,Ⅳ,Ⅴ, representing top, high, medium, lower and lowest grades, respec...