In this paper, the formability of cold rolled steels after laser welding were analyzed. Cupping test show that the difference of thickness of welded blanks can lead to the reduction of IE to a large extent while LDH and Hole Expansion test indicate that the formability of welded blanks reduced with the increase of difference of thickness and strength. FLD of welded blanks also displayed that the formability of cold rolled blanks after laser welding dropped compared with those of the base metal. The location of forming for laser welded blanks should avoid from the complex situation of forming for auto parts.