The MJS Method (Metro Jet System) utilizes a specially designed porous pipe and front-end device to achieve stratum cutting via high-pressure jet flow and inject hardening materials. Combined with an active sludge discharge system and real-time underground pressure monitoring technology, it precisely regulates construction pressure to ensure stable pile-forming quality, while significantly reducing disturbance to the surrounding environment. It is suitable for multi-angle and large-depth foundation reinforcement projects.