Abstract: Qingdao Metro adopts double shield TBM (tunnel boring machine) technology for the first time domestically, to realize the rapid, safe and efficient construction of metro tunnels in hard rock stratum. Taking the construction practice of TBM tunnel section of undersea tunnel of Qingdao Metro Line 1 as background, a complete set of grouting technology is put forward, which adopts bean gravel, cement slurry, cement water glass double liquid slurry composite grouting material and ring hoop sectional grouting technology, effectively solving the quality problem of segment forming. In response to the construction risk of crossing fault fracture zone in offshore area, the comprehensive technologies such as ground fine control grouting and advanced geological prediction are proposed to ensure the safety of TBM crossing construction. Aiming at the problem of low slag removal efficiency in vertical lifting of ultradeep shaft, the technology of turning slag in TBM tunnel is innovatively developed, which doubles working efficiency of conventional scheme, providing a new strategy and idea for efficient construction of TBM under complex conditions and has good promotion value.