Abstract：Wuqiaoling tunnel，the longest single-track railway tunnel in China，is the key project of Lanzhou—Urumchi Railway. It goes through four regional faults，and its geological and geostress conditions are complicated. According to the characteristics of soft rock and large deformation under the complicated stress condition，the comprehensive monitoring is executed during the construction in F4 section. Based on the measured results of the vault settlement，the horizontal convergency，the axial force of rock bolt，the surrounding rock pressure，the steel liner plate stress，the concrete stress of preliminary support，the stress and pressure of the secondary lining，the synthetical factors of the relation between measurement and construction procedure，the relation between surrounding rock pressure and displacement，the forecast of measurement，the developmental rule of multi-measurement items，the longitudinal distribution rule of displacement，the coefficient of lateral pressure，the shared ratio of secondary lining，the time of secondary lining construction，etc. are analysed. And the information is fed back to the construction in time. The structure stability is analysed and the corresponding measures are adopted，which can provide references for data simulation and theoretical analysis. The practice proves that the effect is reliable，the surrounding rock is steady and the structure is in good condition，which can provide a reliable technology reference for the perforation of the section.
