Abstract The climate of southern area is muggy and wet.It is apt to multiply chironomid larva, which is the polluted insect in the system of supplying water of the city.

• 摘 要 南方地区气候适宜摇蚊幼虫孳生，其繁殖迅速，环境耐受力较强，经常污染城市供水系统，且很难通过与氯接触被灭活。