Tunneling by TBM is a complex and systematic project, which involves many disciplinary fields and has multiple constraints. Ensuring the availability of the equipment and accelerating the construction progress are keys of tunneling by TBM. Factors affecting TBM tunneling can be summarized as “4M+1E” (Man, Machine, Material, Method and Environment). The study result shows that highquality management team, good equipment condition and scientific management of material supply, construction methods and environment can bring man’s initiatives into full play, can minimize the construction risks, can make full use of the advantages of the equipment and can achieve rapid boring. 