The soil hydrothermal condition plays a significant role on the study of climate change and vegetation degradation and so forth over the Tibetan Plateau. The accurate characterization of soil moisture will also influence the simulation capability of precipitation in local and its downstream areas. Therefore， with soil temperature and soil moisture measurements at Amdo site of Nagqu Station of Plateau Climate and Environment， Chinese Academy of Sciences， and meteorological data at Amdo Meteorological Station during January to December 2014， this paper investigated the distribution of soil temperature and soil moisture along with their relationship with meteorological factors such as air temperature and precipitation in the middle region of Nagqu over the Tibetan Plateau. Results show that： The soil temperature exhibited sinusoid variation at shallow layer， then the curve is gradually close to straight line with the depth of soil. The soil temperature rose rapidly and the cooling process was quite slow. The freezing and thawing date were delayed with the depth of the soil while the freeze-up period was gradually shortened. The intra-day variation of soil moisture was small at different depths. The monthly variation indicated the structure of single peak， and the maximum and minimum values basically appeared in August and December， respectively. The rate of soil moisture increase was much slower than the decreasing process. The regional distribution derived from GLDAS-NOAH was similar to the variation of observation. The variation tendency of soil temperature and soil moisture was not consistent in one year， though there was close positive relationship between them. The temperature gradient of the shallow layer was obviously larger than the deep layer. The soil moisture of shallow layer was largest， followed by the middle layer， and the moisture was smallest at deep layer. With the transition from dry season to wet season， non-adiabatic heating increased due to the increase of solar radiation. The relationship of soil moisture to meteorological factors varied with different periods， but generally soil moisture was positively correlated with air temperature， precipitation and relative humidity while without obvious relationship with wind speed and sunshine duration.

Keywords： Tibetan Plateau ; soil temperature and soil moisture ; distribution characteristics