Abstract: Currently, for shield construction under complicated geological conditions, hyperbaric intervention is an important way to solve the problems of shield cutters. In this paper, the technology of hyperbaric intervention with diving in slurry is analyzed and studied regarding the problem of excavation face instability and collapse experienced in the process of hyperbaric intervention in the Nanjing Weisan Road river-crossing tunnel N. Face support with slurry pressure under normal excavation conditions and the saturation diving technique are used together to carry out cutter tool replacement, so problems regarding hyperbaric intervention can be solved in cases where supporting the working face with compressed air is impossible.