The water area of the Ebinur, Bosten and Aydingkol lakes, the main lakes in Xinjiang, China, during the period of 1999~2002 is dynamically monitored by using the data of American NOAA and EOS global observation satellites and Chinese FY-1C meteorological satellite. The monthly water areas of the lakes during the period from March to October are calculated, the change characteristics of the water areas of the lakes in the watery and dry seasons and the intermonthly change characteristics are preliminarily understood. The results show that the watery seasons of the Ebinur, Bosten and Aydingkol lakes are the periods from November to April, from December to March, and from January to April, and their dry seasons are the periods from May to October, from April to October and from May to November, respectively. The factors influencing the water area of Ebinur Lake are analyzed by combining the climatic factors. The results show that, except the artificial water consumption, the factors directly influencing the water area of Ebinur Lake are mainly the depth of snow cover on the riparian areas in winter, seasonal precipitation, evaporation and sunshine duration. The strong winds from Alataw Mountain Pass impact seriously the ecological environment in the Ebinur Lake region and its basin. Some practical and effective measures should be taken for controlling the sand drift and for protecting the environment of the lacustrine wetlands in the arid areas.