Abstract: Based on the general observation data collected by meteorology bureau of Oroqen Autonomous Banner of Inner Mongolia from 1981 to 2010, the association of permafrost depth variation with climate changes in Alihe region of Oroqen Autonomous Banner of Inner Mongolia was assessed. The results showed that in the past 30 years, the permafrost depth in this region exhibited an increasing trend with the rate of 7.23 cm per 10 years; the degree of early trend of the end date was greater than that of start date, indicating the permafrost period would get shorter. The variation of permafrost depth was negatively correlated with the changes of snow depth, temperature and precipitation.