Abstract: The repair technology used in a shield tunnel in Tianjin Metro after a water penetration accident was introduced, and the difficulties and solutions in the design were analyzed, relating to crucial content such as the cutting plan of the segment scheme, the adjacent tunnel displacement control scheme, the freezing construction scheme, and the joint waterproof of the repair section. Through discussion of the repair technology towards the shield tunnel water penetration accident, and according to the actual construction situation, the repair scheme was summarized, and the conclusion confirming the feasibility of the repair scheme was obtained in the end, the effect of which was especially significant on the adjacent tunnel displacement control. At the same time, the problems encountered during the design and construction process were also summarized, and corresponding solutions and suggestions were provided.