The article mainly describes the purification effect of different plants to treat the domestic sewage in subsurface flow constructed wetland. According to the analysis,the irises in subsurface flow wetland have a good purification effect for TP and turbidity,and the removal rate reaches to 60% and70%. The Canna and reeds in the fourth and fifth unit have a significant impact in purification,and the removal rate reaches to 12. 2% and 11. 9%. The reeds in the fifth unit have good purification effect for TN,and the removal rate reaches to 15%. The five units all play a considerable role on the purify of CODmn. Wherein,the second unit has a high removal rate in all indicators due to the influence of water quality. In addition,the subsurface flow constructed wetland has a good purification effect on Fuyang River,and the effluent concentration of TP,TN,NO₃^--N,CODmn and turbidity are 0. 01mg /L,3. 1mg /L,3. 5mg /L,2. 7mg /L and 0. 085 degree. According to GB3838-2002,TN is excepted to be below the Ⅴ water standard,the other indicators of the effluent quality meets with Ⅱ water standard.