A novel method, laser welding-brazing is presented to joint Al/Ti dissimilar alloys, in which filler metal is AlSi12 and base metal are Ti-6Al-4V and LF6. With this method, the desirable spatial and temporal temperature distribution can be obtained, and then the shape and quantity of intermetallic compounds can be controlled. In experiments, the process characteristics were investigated with the butted joint, the influence of laser power, gap length, feeding and welding speed, laser irradiation position on the joint appearance, interface behavior and tensile-strength were assessed. The experimental results indicate that the joints with good appearance and high tensile-strength can be achieved with this joining method, although the process requirements are rigorous. The shape and thickness of intermetallic compound layer at different positions in the same joint are various. The joint fracture accrues at the interface between titanium alloy and weld when the heat input is inadequate.