Baoan Lake is located in the southeast of Hubei Province, which is noted for its numerous shallow lakes characteristic of the middle and lower Yangtze valley. It covers a surface area of about 61540 mu(41.03 square kilometres), with a drainage basin of 75000 mu(50.00 square kilometres). A survey yields the sum total of 47 species, belonging to 31 genera and 21 families. The vegetation has a distribution of about 59000 mu (39.34 square kilometres) and accounts for 95.99% of the lake's area. It consists of 3 plantzones and exhibits irregular zonation. According to the assemblage of the varioug species, aquatic vegetation of Baoan Lake may be grouped into 6 associations. The submerged vegetation is the most important one in this lake. The dominant species are Potamogeton maackianus, Myriophyllum spicatum, Vallisneria spiralis and Potamogeton crispus. The lack of emergent nacrophytes is another feature of the vegetation. Data on biomass, based on sampling along 9 transects (involving 80 sampling points, 160 quadrants), are presented. The maximum of biomass occurs in Augusi-September, reaching 82104.1 lons(wel weinght) or 6404.1 tons (dry weight). The biomass of Potamogeton maackianus plus Myriophyllum spicatum accounts for 98.5%(wet weight) or 99.1% (dry weight) of the total. The contents of nitrogen and phosphorus of potamogeton maackinus and Myriophyllum sicatum are determined and their seasonal variation are discussed. The content of nitrogen is 1.61-2.50%(with a mean of 2.07%), and the content of phosphorus is 0.725-2.67%(with a mean of 1.63%) in Botamogeton maackianus. The content of nitrogen is 1.27-2.57%(with a mean of 1.70%), and the content of phosphorus is 1.39-3.02‰(with a mean of 1.98%) in Myriophyllum spicatum. So the two species accumulate at least 127 tons of nitrogen and 11 tons of phosphorus from the lake, which is an important factor making the lake a fine fishery water body. The growth of Potamogeton maackinus, Myriophyllum spicatum and Vallisheria spiralis is studied in this paper also discusses the correct of the macrophytes in fisheries. The last of this paper deals with special ecological phenomena of the macrophytes in the lake. And suggestions are made on the exploitation and protection of the economic macrophytes in Baoan Lake.