Abstract: Based on temperature and precipitation data of 1961-2005,the multi-time scales characteristics of climate variation in the Alashan Region was analyzed by using Mexican Hat wavelet analysis.The periodic oscillation of the annual mean temperature and precipitation variation and the points of abrupt change at different time scales along the time series were discovered.According to the main periods,the trend of climate variation in the future was also estimated.The results indicated that the air temperature increased in the 1980s,and the point of abrupt change occurred in 1986.The drought period was from the 1980s to the 1990s with very little precipitation and the point of abrupt change was in middle 1980s.Based on the main period in the Alaskan Region,it was estimated,that the air temperature had an increasing trend,but the precipitation had a decreasing trend,namely the climate in Alaskan region in the future became warmer and drier.

Key words: Alashan region, Alashan region, Climate change, Wavelet analysis