Changqiao Stream is one of the four upper streams of West Lake. The ecological remediation of Changqiao Streamcreatively integrated sewage disposal technique and landscape garden. Via underground sewage disposal system and artificialwetland, sewage in catchment of Changqiao Stream was disposed physically, chemically and biologically, so as to reduce thepollutant discharge into West Lake. After two years running, the concentration of TP, TN, NH₄⁺-N and COD_Mn were reduced to 0.067±0.041mg/L, 3.54±1.23 mg/L, 0.59±0.46 mg/L and 2.11±0.38 mg/L respectively in 2006, decreasing by 88.5%、 68.8%、 89.1% and 68.0% compared with 2003..