In Zhexi power station of Hunan of China, a species of caddisfly named Amphipsyche proluta MacLachlan has arised in a great quantities (over 10 tons or 1000 millions individual) every year, and becomes a serious biological disaster. The ecological management of this insect are reported in this paper. Down from the dam of Zhexi reservoir, since the flowing speed of water on the river bed is faster, it is difficult to use common methods such as chemical, agricultural, physical and biological control methods to control this insect. Based on the investigation, experiments and analyses in 1997 to 2000, a better ecological measure was suggested to control the pest, which included digging the bigger stone on the river bed away, deepening the depth of water, and slowing down the flowing speed. It is expected that the environment in which the larvae live will be changed and this caddisfly will be controlled, ultimately a fundamental treatment to this insect will be given.