Water gushing and sand gushing even collapse of working face would be induced by cutter replacing of shield in sandy soil stratum. The sandy soil is grouted by mixed grout of concretesand slurry and bentonite under pressure of soil chamber. As a result, a new kind of mixed mud membrane is formed. The cutter replacing work can be carried out after cleaning of hardened grout in soil chamber. The application of the abovementioned technology to a Metro shield tunnel in Guangzhou shows that the technology is rational and efficient. 