The Tian Shan is a famous mountain range in the arid region in China. Prom its southern and northern slopes, there flow many perennial rivers such as Hi He, manas He, maidu He, Weigan He, aksu He and so on.Total annual runoff volume amounts to 56,300 million m³.One of main features of runoff in the Tian Shan is that its vertical zonation being very prominent. The rivers are mainly fed by alpine glacial meltwater, which is also another main feature of runoff in the arid region in China.