Abstract: Ground temperature is an important geophysical parameter in the heat exchange process of land-atmosphere interactions. It plays a significant role in weather and climate change research. Evaluation and comparison of ground temperature from 1981 to 2010 over Inner Mongolia by using the Land Surface Model CLM3.5 data,CLM3.5-clcv data,European Centre for Medium-Range Weather Forecasts Reanalysis data and observation data is necessary. After analysis of temporal and spatial variation of ground temperature in Inner Mongolia,the results show that CLM3.5,CLM3.5-clcv and ERA-Interim ground temperature could be used to reproduce the spatial and temporal variation well.The CLM3.5 is the best with highest correlation coefficient and lowest average deviation and RMS error. The three simulations all have cold bias,especially in warm season.