Abstract: In a extremely arid basin of Central Asia, the Qaidam Depression,wind transport and corrosion are the strongest geomorphological forces.In the eastern part,wind sedimentation prevails, in the western part is the largest yardang field on earth. The authors classify these hills into 8 groups and see the forms as a hypothetic cycle. It begins as an uplifted fan or lake plain, which is dissected by water and wind. Weathered material is removed and the bedrock sandblasted. The bizarre hills are totally destroyed,others remain for a while as low, streamilimed whalebacks. If the direction of the strongest gales change by 150 to 210 degress,two windward fronts will develop. The ratio of their length, width and height id 10:2:1; tis is the same as that found by Ward(1979)in wind tunnel experiments after 200 hours.The end can be presumed as a new plain at a lower level.(with 13 figures and 2 tables).