Abstract: Sprayforming is a developing technology for rapid solidification. Spray atomization is an important process in sprayforming, so the research of its mechanism is of great importance for the improvement of sprayforming. In this paper, author discussed the stale of art on the study of the stages in spray atomization 9 the mechanism and time scale of each stage, the effect of impulse on spray atomization and especially how the variations of physical parameters (such as viscosity, surface tension, relative velocity between gas and liquid, etc).affect the process of spray atomization.