In order to study the evolution behavior of slab surface inclusion during rolling process. By analysis of the line defect on the surface of the slab, it was found that the defect was about tens of microns away from the surface and the width was about 200 μm. Energy spectrum analysis showed that Na and K elements were found in the inner material, indicating that the defect might be caused by slag entrapment due to the irrationality flow field of mold. The evolution behavior of inclusions at different positions of the head and trial slab in the rolling process was investigated by establishing the finiteelement simulation of surface inclusion in the rolling process of continuous casting slab. Results showed that there were cracks around inclusion and these cracks grew with rolling pass. Inclusions in the head and trail slab migrated to the surface of the slab, and the closer the inclusions were to the surface, the easier they would migrate to the slab surface. With the same depth and different horizontal position, as the inclusions were farther away from the slab edge, they were more likely to migrate to the slab surface.