Since the 1970s,the eutrophicated problem of the Lake Dianchi,Yunnan province has been more and more serious, which becomes an important factor limiting sustainable development of the Lake Dianchi Basin. Applying nutrient indexes-chlorophyll-a(Chla), total phosphorustal(TP), total nitrogen(TN), chemical oxygen demand(CODMn) and transparency(SD) as evaluating factors, this paper synthentically evaluated and analyzed the characters and causes of eutrophicated phenomenon in the Lake Dianchi. Based on above study, forepassed control meatures were summarized in detail. And some main problems were specially put forward, which were particularly bias stress on external sources, incomplete defending tree fence and immoderate bed silt cleanup measures. On further thoughts, new control strategies were emphasized on resolving the eutrophicated problem of the Lake Dianchi. They could be concluded as follows: to restore Dianchi ecosytem, to control the pollutants from internal and external sources and to strengthen environmental management in the Lake Dianchi Basin.