Abstract: Taking DP980 dual phase steel laser tailor-welded blank as the object, the welded blanks processed by prepressing and baking at 150-190℃for 10-30 min was studied through tensile test, micro-hardness test and SEM observation, and the properties of the joints before and the joints after baking and the joints under different baking conditions were investigated. The results show that the tensile strength of the welded joint after baking increases by 80-120 MPa, the elongation decreases from 4.88% of the welded state to 2.80%-3.48%; the hardness of the welded joint in different regions increases, especially the hardness of the softening zone increases from about 220 HV of the welded state to about 280HV after baking.The average hardness of different areas of the welded joint increases with the increase of baking temperature, but the influence of holding time on the hardness is not obvious.