青藏高原多年冻土对环境热状态变化的敏感性大。为确保铁路安全稳定地运行，就要求及早对多年冻土地基状态及建筑在其上的铁路构筑物进行长期监测，深入、及时地发展和预测铁路沿线冻土工程地质条件变化及其演变规律，系统地控制它的动态变化及其对线路各构筑物产生不良作用，同时验证相关设计方案、结构形式、施工处理措施等在实际工程中的应用效果，对冻融变形病害段的预测及工程措施分析评估，建立相应病害条件下的防治对策，以便在青藏铁路投入运营后，多年冻土路基的稳定性能得到及时、主动和有效控制。

The multi-year frozen soil at Qing-Zang Plateau possess of big sensitivity upon the change of environmental thermo-state. In order to guarantee the railway safety stable operation，it is required immediately to put forward a long-term monitoring on the state of multi-year frozen ground and the railway structures and buildings constructed on the frozen ground，to discover and forecast the change of geologic conditions along the railway and their developing regularity deeply and timely，so as to systematically control their dynamic changes and harmful effects on structures and buildings along the railway. At the same time，the relative design schemes，structures and construction treatment measures may be verified，sections where deformation defects occur may be forecasted and the engineering measures may be analyzed and evaluated. Corresponding preventive countermeasures under the defect conditions may be established，so as to control the stability of the multi- year frozen ground timely，initiativelv and effectively during the operation of Qing-Zang Railway in the future.