Abstract: Principle tests of submarine emergency gas jet blowing-off process, the small-scale-model of emergency blowing system with gas generator for submerged vehicle, were carried out, which simulated the drainage regularity and the major performance parameters of emergency gas jet blowing-off process while at 100m depth underwater. Physical model which was used to simulate the small-scale experiment of the blowing-off process was built, and the two-phase fluid domain for computing was dispersed and meshed by applying the structured hexahedral grid. The process in the model was numerically calculated while simulating the emergency condition of 100m depth under the sea water. As a result, the research had gained the material description of the gas bubble growing rules and the in-depth understanding of the blowing-off process. The simulation results match the experiment results of actual situation very well as the relative errors of gaseous mixture pressures and blowing-off volumes are less than 5%, therefore the feasibility of the simulating method is proved.