Abstract: By investigating distributing of soil arid over Chinese plateau during recent 40 years. Results showed that there had been the whole and regional distributing in the evolvement of arid over Chinese plateau in 480 months and from July to October. By using wavelet analysis,2 years and 4 years variation period change was identified remarkably. Also the arid had changes amplitude and period,flowed from the sensitivity regions to around in Chinese loess plateau.

Key words: Chinese Loess plateau, Chinese Loess plateau, Soil arid, Sensitivity phase, Characteristics, EOF