【Objective】 The degree and distribution of soil salinity in Manas river basin of Xinjiang were studied to improve the control of soil salinization.【Method】 Based on the Landsat TM image on August 19,2007 of Manas river basin,the typical band was selected through principal component analysis.The normalized difference vegetation index and the normalized difference water index were calculated.And decision tree classification was conducted by combining with the near infrared band.Finally,the distributions of di...