Characteristic of rainfall variability over Xichang Satellite Launch Center is analyzed based on monthly mean rainfall data from a single station during 1974-2013 using the Morlet wavelet analysis and Mann-Kendall analysis. The results reveal that rainfall in rainy season, August and September, shows significant periodicities of 9-16, while the interannual periodicities is weak. Besides, rainfall in rainy season, June and July, shows significant climate abrupt, while there is no climate abrupt in August and September.