To improve the stability during welding and extend the range of optimal technical parameter, joining of Ti/Al dissimilar alloys with V-shape and Y-shape groove respectively is performed by rectangle spot laser welding-brazing(LWB) with homogenize energy distribution. Interfacial microstructure and mechanical property of the joints with different line energies are obtained. The interfacial characteristics of the joints are investigated by scanning electron microscope (SEM) and metallographic microscopy. Results indicate that the thickness of the interfacial reaction layer, which depends on welding line energy, decreases from the top to the bottom of the joint. The unequal thickness of the reaction layer plays a great role in tensile strength of the joint. According to the results of tensile test, joints with Y-shape groove have mixed fracture and fractures in the seam and in the interface. Joints with V-shape groove have fractures in the seam and in the interface. Tensile strength of joint is 80% of the Al alloy matrix up to 290 MPa.