N: 0cm 0cm 0pt" class=MsoNormal>n’,’serif’" lang=EN-US>Based on the dynamic degree analysis and grid calculation analysis of the TM/ETM data in four periods, the status and spatial dynamic variation of grassland sandy desertification in Zhenglan Banner were monitored and studied. The results show that: 1) the change direction of grassland desertification was due to the interconversion of non-sandy and three-level desertification grassland; 2) the change of medium grassland desertification affects the structure and change direction of the grassland desertification prominently; 3) the developing-sandy grassland area is mainly distributed in the southeast of Sain Hudag and the eastern part of Sanggin Dalai; and 4) human factors were the dominant factors during the reversion and deterioration process of grassland desertification.