Abstract: Two fields in Gonghu Lake and Meiliang Lake were investigated for one year.The data of macrophytes,water quality and sediment were analyzed.Results showed that ① the macrophytes communities of Gonghu Lake include Phragmites Communis Trin.,Potamogeton malaianus + Nymaphoides peltata + Myriophyllum spicatum L.and Potamogeton malaianus community;the macrophytes communities of Meiliang Lake include Phragmites Communis Trin.+ Alternanthera philoxeroides Griseb,Phragmites Communis Trin.and Potamogeton crispus community.② Macrophytes in Gonghu Lake mainly grow in spring,summer and autumn,and in Meiliang Lake mainly grow in winter and spring.③ There is significant difference in current species of macrophytes,especially submerged plants between the two lake fields,and the hydraulic condition,the total nitrogen content in water and nutrient content in sediment should be the important factors of this difference.