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Qinghai-Tibet railway is very complex geological conditions, more than 4,000 meters above sea level sections of a total of 960 km, in the continuous permafrost Lot 550 km, there are lots of parts of the island permafrost and deep permafrost lots season. Building a railway in here a few big problems. Temperature slightly increased, the permafrost will melt, and the road above it collapsed, and the winter temperature decreased, permafrost expansion will be built above the roadbed and the top rail, a drop 1 l, very easy to train derailment.

Seismic belt. Tang of La Salle high mountain region is earthquake-prone areas. Railway built along dozens of automatic seismic monitors.

Qinghai-Tibet Plateau region worst snow winter weather, some sections of the Qinghai-Tibet railway in the largest wind up 10. Jin, a Tibetan train safety issues. Pier into permafrost layer over 30 meters, and the permafrost layer bridge between the friction to support the stability of the roadbed, the melting of permafrost and swelling of the roadbed seems to have little impact at this time.

The Qinghai-Tibet railway geology situation is very along the route complex, the elevation more than 4000 meters above road sections altogether account for 960 kilometers, the year continual frozen earth land sector have 550 kilometers, but also has a part of land sector for the island shape frozen earth and the deep season frozen earth land sector. Builds a railroad in here has several big difficult problems. The temperature rises slightly, the frozen soil layer must melt, the above road also collapsed; But the winter temperature reduces, the frozen earth inflates, will construct goes against in the above roadbed and the rail, as soon as will fall a liter, the train is very easy to be derailed.

Earthquake belt. The Mt. Tanggula area is the earthquake succeeds in the imperial civil service examinations the area. The railroad has constructed several dozens automatic earthquake monitoring devices along the way.

The Qinghai-Tibet Plain area winter bad wind and snow weather, the Qinghai-Tibet railway some road section's biggest wind power may reach 10 levels along the route. Enters, the Tibet train movement security problem. Of the bridge pier sneaked in the frozen soil layer more than 30 rice, friction force between the bridge pier and the frozen soil layer supports the roadbed the robustness, the frozen earth melting and the inflation the influence already appeared miniscule by now sufficiently to the roadbed.