Abstract: Under the background of global warming, in order to ensure the safe operation of Qinghai-Tibet railway across the permafrost region,the climate change data along the Qinghai-Tibet railway was collected. The response of railway subgrade to climate change was investigated. In accordance with the pathological changes of subgrade, bridge and culvert, the countermeasures were put forward to ensure the stability of the project in permafrost region of the Qinghai-Tibet railway. The results show that the degradation of permafrost is affected by the increase of temperature and rainfall along the Qinghai-Tibet railway. Measures such as drainage ditch, thermal insulation blind ditch, additional soil protection at the foot of the slope, blocking bed, culvert matrix voids can be taken to prevent water accumulation from causing frost heave effect on buildings,and prevent thermal erosion caused by permafrost. The addition of hot rods, the addition of soil protection roads at the foot of the slope, and the use of sheet(broken) stone protection slopes, sunshade panels, grass planting and other slope thermal protection measures can be carried out to cool the roadbed and protect permafrost.

Key words: Qinghai-Tibet railway, climate change, subgrade, bridge, culvert