Aiming at the problems of Tonghui Lake in Dajiangdong industrial agglomeration area of Hangzhou, such as no water diversion condition, access of rainwater outlet, sediment pollution and serious nitrogen and phosphorus pollution, the comprehensive water environment control measures such as ecological retaining wall, sediment locking, microbial enhanced remediation and aquatic phytoremediation were put forward. The results of water quality test before and after treatment show that the comprehensive pollution index of water quality increases from 1.63 to 0.52-0.61, and the water quality status is improved from heavy pollution to light pollution.