Abstract: In order to improve the homogeneity of metallurgical reaction on the bonding interface between seam and steel so as to improve the tensile strength of a specimen, the effect of V-shaped grooves on properties of laser welding-brazing steel-aluminum butt joints was discussed by means of simulation combined with experiments. Frist, the temperature field of laser welding steel-aluminum butt was simulated by means of ANSYS. It was found that the temperature gradient on the bonding interface when there was a V-shaped groove on galvanized steel was lower than that when there was no grooves on galvanized steel. Then the experiments were carried out for laser welding steel-aluminum butt joints with and without V-shaped grooves on galvanized steel respectively, and the specimens were subjected to a tensile test. The result showed that distribution of intermetallic compounds on the bonding interface between the seam and galvanized steel with a V-shaped groove was more uniform than that without grooves. The V-shaped groove on the base material made the fracture far away from the bonding interface and the mechanical property of the joint was improved significantly.