Effects of current intensity in electromagnetic stirring on microstructure and properties of continuous casting 30MnVS slab were investigated.The results indicate that with current intensity increasing from 50A to 250A,exquiaxed rate in the slab is increased by 53.3%,meanwhile,C and S elements in the slab are decreased by 50% and 14.3%,respectively,evidently improving segregation degree.With increasing in stirring current intensity,morphology of sulfides in the slabs is converted from rod-like structure into spheric and block structure with more uniform distribution,which is responsible for the improvement of mechanical properties of the slab as a result of improving the distribution of pro-eutectoid ferrite,where tensile strength and toughness are increased by 7.8% and by 24.4%,respectively.