The cavitation performance of propellers is studied based on viscous multiphase flow theories.With a hybrid grid based on Navier-Stokes (N-S) and bubble dynamics equations,some recent validation results are presented in this paper in the predictions of the thrust,the torque and the vapor volume fraction on the back side of propeller blade for a uniform inflow.The numerical predictions of the hydrodynamic performance and the sheet cavitation under several operating conditions for two propellers agree with the corresponding measured data in general.The thrust and the torque are plotted with respect to the advance rate and the cavitation number.The cavitation performance breakdown is closely related to the strong sheet cavitation around propellers.The models with parameters modified are shown to predict the propeller cavitation well.