The main reason of water population was: no-point pollution was serious caused by soil and water loss in upper reaches of Chaohe river;the amount of entering wa.

• 依据水质自动监测系统数据,对密云水库重要入库支流-潮河古北口省界断面水质变化趋势、水质特性等进行了详细讨论与分析。