In this paper, the wetland in Hexi Corridor was dynamically monitored by remote sensing technology using four different

temporal remote sensing data. The results show that the area of the wetland was 14 132.38 km2 in 1973, 13 299.44 km2 in 1990, 12

519.88 km2 in 2000, and 12 312.38 km2 in 2006. In the past 30 years, the reduced area amounted to 1 820.00 km2, which occupied

12.88% of the total area, with the dynamic degree being -0.39%. Natural wetland has been reduced continuously at an accelerating

speed, with swamp reduced most significantly. Meanwhile, the area of man-made wetland has steadily increased, especially in

recent years. The number and density of wetland patches have increased, and the fragmentation degree now is higher than that in

the past. The diversity index and evenness index have increased continuously, the difference between the proportions of  various

wetlands have decreased, and the distribution wetlands tends to become uniform. Temperature, precipitation, uplift of the Tibetan

plateau and other natural factors seem to be the important causes for wetland change in Hexi Corridor. In addition, human

activities have undoubtedly aggravated such a tendency.