This study was conducted in order to know the evolution feature of the seasonal mean air temperature in Inner Mongolia during 1953 - 2013 under the background of global climate change. The abrupt changes of the seasonal mean temperature of air was tested using the M - K test method,sliding T - test method and accumulated deviation,the trends of seasonal air temperature were analyzed using linear least squares fitting,the periodicity characteristics of seasonal air temperature were studied using morlet wavelet analysis method,and the periodicity characteristics were forecasted using GM(1,1) model. The results show that average air temperatures of spring,fall and winter abruptly warmed in the late 1980s,average air temperatures of summer abruptly warmed in 1993 at the confidence levels of 99%,seasonal air temperature showed a significant warming trend. It were forecasted that spring,summer and winter average air temperature will be high in 2015,and be low in 2018,fall average air temperature will be low in 2016,and be high in 2018.