Abstract: Ellipse spot and rectangular laser spot were used as the heat source respectively to experimentally research laser welding- brazing with filler wire for Al Ti dissimilar alloys.And the influence of gap and heat input on weld appearance were analyzed, furthermore, the welding interface characteristics with different heat source were obtained.Experimental results show that both ellipse spot and rectangular beam can gain the good weld appearance.Increasing heat input is of advantage to enhance the interface strength, but it is of disadvantage to control the weld appearance.Welding stability and processing control with rectangular spot are better than those with ellipse spot.The maximum tensile strength of joint gained by ellipse spot and rectangular spot is respectively high up to 75% and 80% of aluminum base material.