Abstract:Taking the oasis of the Yarkant River Plain as the study area, Landsat remote sensing images in 1991, 2005 and 2016 were selected, and land use types were quantitatively extracted and analyzed by using RS and GIS techniques, and social and economic data in the same periods were used to extract and analyze to construct the evaluation index system of land ecological security by using PSR model, the weight of each index was determined by entropy method, and then the land ecological security levels from 1991 to 2016 were evaluated synthetically by using the method of comprehensive index evaluation on the time scale. The results showed that during 1991–2016, except for cultivated land and construction land, the areas of other land use types decreased, and woodland decreased most, by 47.12%. The comprehensive index of land ecological security in the oasis of Yarkant River Plain showed an increasing trend, among which, it was at the risk level during 1991–2007, and changed to the sensitive level in 2018–2–16 with the improvement of land ecological environment, but it still indicated a poor land ecological environment. To improve the land ecological security of the oasis in the Yarkant River Plain, it is necessary to increase the fund investment to promote the ecological construction in strengthening land use supervision and management, controlling population growth and alleviating contradiction between people and land in order to lay a solid foundation for the sustainable development of land ecological security.