Based on the observed data of monthly soil temperature in different depth and air temperature from 8 representative meteorological stations in Tibet Plateau from 1971 to 2013, by using the linear trend analysis method and Mann-Kendall method, the changing tendency of annual and seasonal soil temperatures and air temperature, the difference of soil and air temperature (Ts-Ta), and the abrupt change relationship between soil temperatures and air temperature were analyzed, the trend of soil temperatures in the future was predicated. The results showed that annual shallow soil temperature (SST) increased significantly (P<0.05), in which those in western and central of Tibet Plateau were more significant than that of in eastern, seasonal soil temperature increased significantly, and that in winter and spring were more significant than that of in summer and autumn. Deep soil temperature(DST) increased significantly except for in Qamdo (P<0.05), even much more than shallow soil temperature in Senggecangbu, Xigaze and Lhasa. The annual difference of SST and air temperature was bigger than DST in Senggecangbu, and similar to that of in Xigaze and Lhasa before 1990s, but it was equaled to that of DST after 1990s. The situation in Qamdo was that SST lower than that of DST before 1980s, and higher than DST after 1980s. There was extremely significant positive correlation between average annual soil temperature in different depth and average annual air temperature, and there was significant positive correlation among soil temperature in different depth (P<0.01). It was predicted that soil temperatures increased significantly in the future, and increasing range of soil temperature was higher than that of air temperature. It was projected that the soil temperatures in Qamdo, Lhasa and Bome could be approached that of in Baxoi, Tsedang and Zayu by the end of the twenty-first century, respectively, which means all of the sites could be moved one latitude toward south.