Two-fluid model was employed to simulate two-phase phenomena of supersonic crossflow.Calculations were carried out under different diameter droplets and different momentum flux ratio conditions respectively to examine how they affected flow field.Numerical simulation results show that the cross-stream penetration of the jet is influenced evidently by the droplets diameter and momentum flux ratio;and the downstream flow of the muzzle changes when the droplet diameter or momentum flux ratio varies.The calculation results agree well with experimental results.