The treatment of eutrophication for lake water body by electro-hyraulic power pulsed technology is presented. The operating principle of electro-hyraulic power pulsed technology, mechanism of purifying eutrophication for lake water body and some experimental results are briefly introduced. A lot of experimental data obtained from experimental study show that electro-hyraulic power pulsed technology is feasible for the treatment of eutrophication for lake water body, and is a very effective method.