Abstract: Submarine vehicle will take on the load due to cavity collapse during water-exit, on condition that cavity occurs. Ventilation is an effective method to decline water-exit load. As for ventilation, a set of methods was developed, which included normal k-ε turbulent equations, VOF multi-phase model, Zwart-Gerber-Belamri cavitation model, dynamic mesh and UDF function. The process of water-exit with ventilation was simulated. The effects of ventilation volume, sequence, and method on cavity configuration and water-exit load were studied. Some basic conclusions were drawn.