"Drinking water pollution" has become the most important water environmental problem. In recent years, incidents endangering the safety of public drinking water have occurred frequently 2013: Hejiang, Guangxi---Heavy Metal The Beijing-Hangzhou Canal---Chemicals Erik Nur Lake---Petroleum Xiangjiang---Dead Pig Forest---Yueyang Forest&Paper, Baotou Steel Group Tailings Dam , Chenming Paper, Apple foundry (Milk River) 2014: Lanzhou, Gansu---Tap Water Benzene Wuhan Section of Han River-Ammonia Nitrogen Guangdong Shunde Water Source-Heavy Metal Pollution of Wushan Qianzhangyan Reservoir Sewage discharge in Tengger Desert, Inner Mongolia Xiangjiang-Arsenic, 715 times Taoyuan, Hunan-Aluminum Daxin County, Guangxi-Cadmium Antibiotics detected in major rivers across the country in December