According to the ideas of set pair analysis and the connotation of spatial analytic geometry,a method for quantitatively evaluating the regional system coordination was designed,which was used to evaluate the coordination of economy-society-environment system.Based on the method and model,the coordination of economy-society-environment system in 88 counties of Hunan Province was evaluated.Results showed that:(1)With exception of a few areas,the system coordination level was associated with the economic situation in a certain extent.The synthetic coordination level had a significantly positive correlation with economic situation.(2)From the spatial pattern of system coordination,the overwhelming majority of the counties with high comprehensive level were located in Eastern and Southern Hunan Province,while the counties with low comprehensive level were distributed mostly in Center and West Hunan Province.(3)From the spatial distribution of various combined types of system coordination,most counties of Eastern Hunan Province belonged to the type of high comprehensive level and good coordination,while most counties of the west and north of Hunan Province belonged to the type of low comprehensive level and good coordination or the type of low comprehensive level and poor coordination.The result may provide reference for promoting coordinated development of different counties in Hunan Province by adopting corresponding strategies.