Research on ecosystem service value is a hot spot in ecology at present. Based on the Costanza's ecosystem service value theory and combined with the landuse change traits in the past 30 years in Chongqing urban,the impacts of landuse change on ecosystem service value are analyzed. The remote sense images in 1975,1987,1995,2000,and 2005 are interpreted and the landuse drafts are obtained. Single dynamic landuse degree and landuse extent index are used to indicate the landuse change. According to each type of landuse and its single ecosystem service value,the ecosystem service value is calculated,which is used to analyze the whole change in ecosystem service value and the change in the structure of ecosystem service value. In view of the influence of landuse on ecosystem service value,ecosystem effect index and ecosystem effect degree are introduced to ascertain the influence extent and absolute influential power resulting from the landuse change. Results indicate that,firstly,the expansion speed of constructive land in the area should be controlled properly and the intensive degree of constructive land in mountainous city should be promoted. Secondly,in the scale of controlling economic rising,the increasing speed of landuse extent should be slowed down. Lastly,the planning of eco-water and eco-forestry should be strengthened in order to enhance ecosystem service value in mountainous city.