The applicability of TBM in line 6 of Chongqing MRT project is a key point for the successful construction of the project. In the TBM design phase, the cutter head and cutting tools, the main bearing, the support system and the belt conveyor system of the TBM are specially designed to cope with the specific rock geological conditions. The main problems occurring in the TBM boring phase, such as problems in shotcreting, belt conveyor mucking system, vertical material transportation system, cutter head and cutting tools and interference between tunnel lining and Metro station construction, are discussed and countermeasures are proposed. The practice shows that the applicability of the open TBM in rock geology is improved due to the special design of the equipment and the countermeasures taken. 