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In this paper, some results of the nonlinear liquid sloshing experiments and dynamical analysis of flight systems were presented.By displacement sensor methods, the liquid nonlinear sloshing forced by vertical excitation in a circular cylindrical tank with spherical bottom were observed in experiments, the relationships between liquid drop ejecting and maximum exciting accelerations are demonstrated[1].And it was also indicated that the mechanism of liquid drop ejecting depends on excited frequencies and surface tension coefficients relying on gravitational waves and capillary waves on liquid surface.