Abstract: Wind erosion climatic erosivity is one of the important signatures of potential wind erosion intensity. Based on the field monitoring data in Dunhuang Yardang Geo-park during 2013 and 2014, including wind velocity, precipitation, air temperature and air relative humidity, wind erosion climatic factor index is computed and analyzed month by month. The results are as follows: (1) The wind erosion climatic factor index is 151.98±0.13, and Dunhuang Yardang Geo-park is one of three maximum value areas in China; (2) Compared to other arid and semi-arid regions in China, the seasonal variation characteristic of wind erosion climatic factor index is unique in Dunhuang Yardang Geo-park, and there are the maximum values in summer, high values in summer and spring while low values in autumn and winter. It's similar to that in the Hotan region of Xinjiang. (3) The wind erosion climatic factor index has monthly variation characteristic with continuous high values between April and August, and low values in other month; (4) The wind erosion climatic factor index is strongly related to average wind velocity, while it is little affected by precipitation; (5) The wind erosion climatic factor index is almost more than 150 in regions with yardangs formation and evolution.

Key words: wind erosion climatic erosivity, wind erosion climatic factor index, yardangs, Dunhuang Yardang Geo-park