Abstract: Based on the results obtained in recent two years and the previous study materials, the dynamic changes of the aquatic vegetation in East Lake during the past 30 years were investigated and the correlation between the changes and some controlling factors such as the eutrophic and the fishery was analyzed. It was shown that the adverse succession of aquatic plant communities in East Lake exhibited the following seres:Potamogeton maackianus stage;Potamogeton maackianus +Najas major + Ceratophyllum demersum + Myriophyllum spicatum stage ; Potamogeton maackianus disappear stage;Najas major ruins stage;secondary bare area stage. Najas major+ Myriophyllum spicatum+Vallisneria spiralis stage at the present time in some subregions was the early phase of secondary succession. The mechanisms of species replacement in the succession seres were also explored with some characteristics of morphology, structure, ecophysiology, life span and reproduction strategy and interspecific relationship, etc. The aim was to provide the theoretical basis for the restoration and artificial control of aquatic vagetation.