Changdang Hu Lake,situated in Jiangsu province, is a shallow lake(average water depth 1.0 meter) with an area of 90 square kilometres. The lake is rich in submerged plants, about 70% is covered by Potamogeton maackianus Benett.There are altagether 60 species of fishes in the lake, and the total fish yield in 1983 is 11.5 tons about 0.68 kg/ha. The paper is a result of investigation in 1983-84. Data concerning the species composition, community structure, ecological distribution and submerged plants biomass of the aquatic vegetation are reported. The succession of the aquatic vegetation ieads to the dynamic changes of the population structure of fishes, tha abundance of phytoplankton, zooplankton and the benthos. By analysing the data, it was found that the aquatic vegetation in Changdang Hu Lake has followed a long succession from richness to declination,from recovery to richness during the last thirty years. Accompanying with the succession, the changes of fish nompasition, fish stacking and fishing gear have also occured. Basing on the viewpoint of lake ecology, the paper emphasized the importance of the submerged vegetation resource, and implied the possible succession trends of Changdang Hu Lake fishery ecosystem. Lastly, some suggestions on development of lake fishery have been made.