An artificial floating bed experimental project in which reeds served as the floating bed plants was carried out on the adjacent water of Qingcaosha Reservoir in the Yangtze River Estuary to study its growing state and nutrient uptake ability.The results showed that the average density of reeds increased gradually during the experiment with the lowest value of(25.6±2.5)ind/m² in May and highest(100.7±15.3)ind/m² in July, and the difference between months was significant (P<0.05).The plant height increased from(2.6±1.4)cm in May to(55±15.5)cm in July with significant difference between months (P<0.05).The average density of reeds was highly correlated with the plant height (R=0.904).The fresh weight of reeds per unit area was(0.212±0.045) kg/m², the dry weight of reeds per unit area was (0.063±0.013) kg/m², the TN concentration of reeds was (1.33±0.03) mg/g, the TP concentration of reeds was (0.27±0.01) mg/g.TN fixed amount per square meter was (83.67±17.01) mg/m², TP fixed amount per square meter was (17.33±4.16) mg/m².