Abstract: In order to further study the construction impact of the omni-directional high-pressure jet（Metro Jet System） construction method, based on an excavation project in Suzhou, the deformations of the underlying subway tunnel caused by the construction of MJS soil reinforcement method are measured and analyzed. The results show that: during the construction of MJS method piles,（1） generally, the displacements of the vault, bed and haunch of the subway tunnel within the construction scope of MJS pile are upward, and the clearance is compression, whereas the corresponding values outside the construction scope of MJS pile are subsidence and stretching.（2） The maximum displacement and clearance convergence of vault, track bed and haunch of each monitoring section of subway tunnel meet the design requirements.（3） The longitudinal deformation of subway tunnel changes in a “bow” shape. The study concludes that the adoption of the MJS construction method for group pile jumping construction is beneficial to reduce the influence of soil reinforcement in the pit on the deformation of the underlying subway tunnel.