Abstract: Abstract: In order to study the influences of urban lakes eutrophication on the elemental compositions of aquatic macrophytes, carbon (C), nitrogen (N), and phosphorus (P) ecological stoichiometry studies were conducted on six common aquatic macrophytes in three lakes during the growing season, and key environmental factors that driving the changes of the leaf elements were explored. The results showed that: (1) The changing ranges of C, N, P contents in leaves of aquatic macrophytes in different lakes were respectively from 397.03 to 672.70 mg/g, 10.63 to 39.16 mg/g and 1.15 to 13.30 mg/g; the ranges of C/N, C/P and N/P were respectively from 13.15 to 50.36, 31.39 to 458.60 and 1.88 to 19.06, among which P contents in leaves varied the greatest and C contents varied the smallest. (2) Spearman’s correlation analysis suggested that the elemental compositions of leaves of Phragmites australis,Nymphaea tetragona and Ceratophyllum demersum had significant correlations with the eutrophication index of water bodies; P contents in leaves increased with the rise of the lake eutrophication index, but C/P and N/P in leaves decreased accordingly. (3) RDA analysis showed that the changes of C, N, P contents and C/N/P in leaves of aquatic macrophytes in spring were mainly affected jointly by the permanganate index (CODMn) of the water and the total organic carbon contents of sediment (SOC); while in summer they were affected mainly by the concentrations of total phosphorus in water (TPW), and in autumn by the contents of the total phosphorus in sediment (TPS).