The vibrating process of crystallizer during continuous casting was carried out by using the finite element method, and the stresses near slab surface at different stages were analyzed under various taper ratios of crystallizer, friction coefficients between crystallizer and slab, pulling speeds of slab, and slab widths. Results show that the stress concentration appears in the slab surface near the tail end of crystallizer. The maximum stress in slab surface increases with decreasing the taper ratio of crystallizer, and with increasing the slab width. And influence of the pulling speed of slab and the friction coefficient between slab and crystallizer on the maximum stress in slab is slight. It is of significant for analyzing and understanding the initiation of vibration marks on slab surface and the fraction and wear of crystallizer.