Object-oriented technique is a new method providing more accurate mapping product with higher detail.In this paper,TM images of 2010 were selected as the data sources.Based on object-oriented method,six categories information of west Liaohe river basin were extracted,including cultivated land,forest land,grassland(xero-mesophytes and hygro-mesophytes),water and unutilized land.Comparing and analyzing the spectral and spatial information among the categories,appropriate threshold were set in membership function.Meanwhile,the field spectral characteristics analysis was utilized to help in determining the appropriate grassland classification rules.Then combining classification tree,the automatic classification was accomplished and the general accuracy was 82.13%.Moreover,we discussed the characteristic of vegetation distribution in study area.Using spatial analysis of GIS to statistic different vegetation area,different vegetation area in different counties and relationship between vegetation and first class river,the results showed:(1) forest land and grassland were predominant vegetation in study area,which area accounted for 38.9% and 23.3% respectively.(2) Forest land,cultivated land and hygro-mesopgytes were mainly distributed in counties which located in middle and lower reaches of the river.Influenced by human impact,cultivated land and forest land concentrated distribution in Horqin Left Middle Banner and Horqin Left Back Banner.(3) Forest land and hygro-mesophytes were mainly distributed in 10 km buffer zone of the first class river,cultivated land concentrated distribution in 5km buffer zone of the first class river.