Based on object-oriented method, six ETM + satellite images of the year 2002 were interpreted and analyzed to study the seasonal change of the lakes in Tengery Desert. Result indicates that lake level changed sharply over the years. That is, both the amount and the area of the lakes in Tengery Desert reached their summits in summer (June), while the lowest amount and level in winter. This phenomenon differs from that of the Badain Jaran Desert, in which the lakes have their high level during winter. The difference to some extent explained the different replenishment patterns between the lakes in two deserts:lakes in Tengery Desert would be recharged by precipitation and adjoining ground water, but those in Badain Jaran Desert would be highly affected by longdistant ground water.