Abstract: In Yunnan province,it is important to assessment and recognize eco-environment background since its special physical geographic condition of mountain plateau.The data investigation and collection,multi-subject spatial databases were got by the ways which included NDVI,slope,precipitation,temperature and altitude.By using GIS and image processing technique,the eco-environment background condition was appraised based on the synthetical model.The integrated assessment index was used to analysis the general characteristics and the regional difference.The primary results showed that:The eco-environment background condition of Yunnan province was better in general since the index mainly concentrated the high level relatively.The spatial distribution of eco-environment background condition represented the regional difference from north to south.In general,the most best eco-environment background condition in Yunnan plateau mountain region was distributed in south and southwest,the relative worse ecological environment background condition was distributed in north and northeast,the other vast area belong to middle level grade.