Abstract: Wind is one of the most important factors that influence the sand and dust weather. So understanding the impact of wind speed change caused by global warming can play a guiding role in environmental protection. In this paper, the wind speed, air temperature daily data of Shaanxi-Gansu-Ningxia area in 1960-2014 were analyzed with Mann-Kendall method, linear regression method and Spearman correlation analysis method. The following conclusions are drawn: (1) The air temperature in Shaanxi-Gansu-Ningxia area showed an upward trend. The winter air temperature increased most quickly, and a abrupt change occurred in 1994. (2) In recent 55 years, the annual average wind speed rate showed a downward trend with 0.07 m·s^-1·(10a)^-1 in Shaanxi-Gansu-Ningxia area. The wind speed decreased more obvious after the temperature abrupt change. The average wind speed in spring declined the fastest, followed by the winter, the slowest in summer and autumn. (3) The wind speed gradually increased from the center of Huanxian, Yan'an, Xiji, Hequ; and the regional average wind speed had an overall downward trend. After the temperature abrupt change, the wind speed decreased in middle Shaanxi-Gansu-Ningxia area. (4) Under the background of climate change, there is a negative correlation between air temperature and wind speed.

Key words: global warming, wind speed, Mann-Kendall mutation testing, Shaanxi-Gansu-Ningxia area