The wetlands of Lake Aibi, Xinjiang Autonomous Region has played a significant role for regional ecosystem.The diversified desertificate ecosystem was typical due to its location as well as its geomorphology.The land desertification in Lake Aibi was monitored and analysed based on the RS and GIS techniques during 2000 and 2002.By monitoring land type with hybrid method and post-classification method basing on the image classification, the interrelated data and ground investigation are applied to determine the change of desertification land use/cover in Lake Aibi district.In order to show the present desertification condition, the ground investigations are combined with RS imaging.The results revealed that the wind-eroded and saltified desertification have absolute dominant in Lake Aibi region, i.e: the wind-erosion (xxupied 25.82%, whereas saltified desertification 61.86%.With regard to degrees of desertification, the middle levels had occupied 95% of target fields, among which the heavy levels was more than 27.92%.Investigations also revealed that the area of wind-erosion desertification in Lake Aibi region has reduced 53%, about 403.06 km² from 2000 to 2002.However, the rising of undergroand water level as well as the increase of lake level has aggravated saltified desertification in some areas.Compare with 2000, the saltification-desertification area had increased 183.7 km² in 2002, while the middle and heavy level of wind-erosion area had reduced 402.78 km², The degree of desertification tended to decline.The heavy wind-erosion and heavy saltification land belonged to bad lands in and lake regions, which could be the main source of sandstorm in northern Xinjiang.In recent years, the extending of Lake Aibi surface has turned part of the previous lands into wetlands.NevertheJess, the Lake Aibi region was still threatened by desertification.