Abstract:Comprehensive assessment of regional ecological environment is great important and yet short of unified theory guidance and improved index system. Taking Longkou as an example, object-oriented theory was used to establish assessment system after analyzing ecological environment characteristics in the study area. Remote sensing and GIS techniques as well as mathematical methods were applied to extract assessment indicators. Modelling spatially fuzzy assessment was established based on GIS raster data to integrate these indicators. The results showed that the ecological environment status in Longkou city was generally good in 2008. The proportions of the excellent grade, good grade, the moderate grade, and worst grade were 24.75%, 41.78%, 5.29%, 28.18%, respectively. The spatial differentiation was significant, and the assessment grade improved gradually from northwest coast to southeast inland. Ecological environment status and change trends among 3 typical partitions were different. Weather conditions, land use change, industrial construction, population migration and other factors played the main role in the status and changes. According to real condition and spatial distribution of heat island effect in study area, this method is effective and it is the useful complement to current assessment methods of regional ecological environment.