Abstract: Ecological environment has fragility and land desertification is very serious in Xinjiang.With the support of remote sensing and GIS as well as related techniques,land desertification mechanism and process are studied. At the same time,building up monitoring and forecasting danger system of desertification disasters has an important significance for ecological construction in Xinjiang.There are several desertification types in Xinjiang,such as,soil salinization,soil erosion and land sandy desertification,and so on.Taking Alagan area,the lower reaches of Tarim River in Tarim Basin,the rate between desertified land area and total area is increased by 86.98% in the end of 1950s to 94.78% in the later period of 1990s.Affected by desertification,the disasters that have close relationship with desertification are mainly in existence in four geographical areas.Meanwhile,some disasters including drought and strong wind as well as sand dust storm happen frequently,which severely affect regional ecosafty.The integrated countermeasures are of important strategies for ecological construction.