In order to restore damaged lake aquatic vegetation, a research was carried out on the aquatic vegetation restoration and its structure improvement and water quality in the controlled ecosystems which were made of waterproof cloth and nylon net in Kasi Lake (Wuhan). The results show that in the controlled ecosystems. the biomass of aquintic vascular plants increased obviously. the floating plants settled down easily. To limit fish culture was the primary way to restore aquatic vegetation. The aquatic vegetation restored naturally was simple in structure. By choosing fine plant species and having them planted scientifically. the aquatic vegetation can be restored faster, and its structure improved. Submerged plants would be the main aquatic species in restoration vegetation. The well grown aquatic vascular plants can decrease N, P concentrations in water body and phytoplankton biomass. The Nelumbo nucifeia, Phragmites coifunmiis, Vallisneria spiralis, Myriophylhun spicatum and Ceratophyllum demersum are qualified for adaptability, and can be selected as the species to rebuild the aquatic vegetation in East Lake (Wuhan).