Studies on the aquatic vegetation in Fengqiu Experimental Area show that emergent plants belonged to a dominant vegetation type although the number of their speies was rather low and their total biomass was considerably high, with a maximum biomass of 2.9×10⁸ kg (FW) and 1.3×10⁷ kg(FW) respectivetly in two major water bodies of the area. The distribution area of emerged plants was also the largest among all vegetation types in almost all kinds of water bodies except in Caogang Lake, in which submerged plants occupied more open water area of the lake but the peak biomass of submerged plants was reaching up to mere 3.2×10³ kg(FW). Major types of association are described in the paper. Growth analysis shows that emerged plants grew well in the area. Effects of water depth on their growth was considered to be unimportant. Nutrient content was also unlikely to limit the growth. Sediment organic content and redox potential were the possible limiting factors. Fishery capacity of submerged plants in Caogang Lake was calculated to be 53.8kg grass carp per year. It is concluded that grazing pressure and low water transparency were the limiting factors to the growth of submerged plants. Growth analysis also shows that Phragmires communis mainly germinated from March to May and flowered from July to August. Its peak biomass was reached in August, then entered its reproduction period. Relationship between biomass and other growth indices of P. communis was analysed. The equation shows that instantaneous biomass was positively linear related to its density. The relationship between major growth indices and time indicates S-shaped curve.