Abstract: Metalloscope and energy spectrometer were used to investigate the behavior of solidification and growth of Al-6Si-2Mg alloy. The results showed that in the vibration process of sloping corrugated plate, the alloy solidification process is accompanied with non-dendritic structure evolution and direct growth behavior of spherical grains when the molten alloy is flowing along the plate surface. The sloping plate can provide sufficiently the under-cooling for nucleation and lay a foundation for heterogeneous nucleation to form lots of nuclei of crystal internally and on the sloping plate surface, thus causing the melt to nucleates eruptively. Under the action of both metal flow and vibration, the nuclei formed on the sloping plate surface can move freely and disperse into the melt, and they are able to maintain the direct growth in spherical shape in the homogeneous composition and temperature fields. Both eruptive nucleation and direct growth of spherical grains are one of the important mechanisms of grain refining and spheroidization of the alloy under conditions of vibrating the sloping corrugated plate.