“…At present, there were no certain methods to evaluate eco-environmental warning. APH [3], fuzzy matter-element method [4], support vector machines (SVM) [5], comprehensive index model [6], system dynamics model [7] and RBF neural network [8] were used in ecological environmental warning assessment, and water ecosystem [9], forest ecosystem [10], agroceosystem [11,12], oasis ecosystem [13], land ecosystem [14] and urban ecosystem [15] were the main research fields, but there were few studies about watershed ecosystem. Based on eco-environmental warning assessment principles, combining with regional characteristics of study area, we selected 38 indexes which had indirect and direct influence on nature, society and economy, and were divided into three hierarchies.…”