Abstract：The Qinghai—Tibet railway under construction traverses a 550 km long continuous permafrost region. The railway embankment constructions within permafrost regions substantially disturb the heat and mass transfer balance between the ground surface and the atmosphere，and cause redistribution of temperature field underneath. Deformation feature of embankment in permafrost regions differs from that in non-permafrost regions. Moreover，deformation feature of embankment is one of the most important factors which influence the stability of embankment. Based on monitoring of temperature and deformation of a segment of railway embankment in high-temperature and fine-grained permafrost regions on the Qinghai—Tibet plateau，the depths of seasonal freezing or thawing with time，the characters of deformation of the embankment，and the ground during an entire freezing-thawing cycle，were analyzed. The results indicate that the permafrost table rose after the embankment completion，and differential deformation occurred in south slope and north slope. Frost-heave deformation occurred on the top of embankment was caused by the deformation of the ground and the embankment body did not see frost-heave deformation. Precipitation had important impact on the deformation of embankment. In the end，some suggestions for reducing deformation of embankment were proposed.
