Based on Geographic Information System,in accordance with the diversified and real remote sensing image data and other materials,this research assesses ecologicall security for the reservoir area in Chongqing one-hour economic circle.Spatial analysis in GIS and geostatistics are used to analyze the geographical information about the research area.This research adopts the scientific method to build the evaluation index system,grade evaluation rank,and make comprehensive evaluation analysis.This research obtains ecologicalsecurity evaluation results of this area in 2000 and in 2010 and the changing situation of ecological security in this period.