Xixi National Wetland Parkin Hangzhou City is the only national wetland park which includes urban wetland,agricultural wetland and culture wetland.Not only does it have tourism and education functions,but also can protect the ecosystem and regulate climate.Compared with the natural reserves,Xixi National Wetland Park is more easily affected by human activities.This paper selected gate establishment,pool improvement,boat cruising and pedestrian as study objects,and an investigation is carried out to study their impact on water quality from March to December in 2009.The results showed that gate establishment and pool improvement could improve the water quality,and boat cruising and pedestrian has little impact on the water quality.