The practice of controlling lake eutrophication has come a long and difficult way from controlling nutrient, direct killing algae to biomanipulation and ecolog ical restoration.Although many countries have put a huge amountof money into it, little effect has been produced yet.Lake eutrophication is still a serious global hy dro-environmental problem.Toreview and analyze experience and lessons drawn from researches and practices in this regard will undoubtedly be very beneficial to the adoption of more feasible techniques in effectively controlling lake eutrophication.After a comprehensive survey into worldwide research results in controlling lake eutrophication, itis obvious thateutrophication is a typical ecological problem.Ecological problems can only be solved through ecological ways.Since eutrophication can not be quickly controlled in whole-lake scale, it's the key how to centralize technical and financial resources for controlling the eutrophication in some important areas where human production and life are g reatly affected by eutrophication.Gradually, the degraded ecosystem might be remedied;selfpurifying capability enhanced and water quality improved.A healthy lake ecosystem will be restored finally.