Focusing on the slurry gate malfunction occurring 27.2 m to the starting point of the trail boring of the 11.38 m slurry shield machine during the boring of the left tube of Wuhan Yangtze River Crossing tunnel, the authors study on the malfunction and present the repairing scheme in the paper. First, the workers enter the chamber, examine the malfunction and temporarily repair the slurry gate under hyperbaric pressure and at the same time proper reinforcement position is determined so as to repair the slurry gate completely. Secondly, when the shield machine reaches the predetermined reinforcement position, the shield machine stops boring and permanent repairing of the slurry gate is executed under atmospheric pressure. In the end, the repaired shield machine bores through the reinforcement zone safely, which guarantees the rapid and safe boring of the shield machine under the river bed. The presented repairing technology can provide reference for the repairing of slurry gates and other facilities in the slurry chamber in the future.