Double laser welding technology was used to weld the T-joints of TC2 and TA15 titanium alloys, and the joints were heat-treated at 650 ℃ to remove the stress. The microstructure of the joints were analyzed, and the mechanical properties of the joints were tested. The effect of heat treatment process and vertical bars on the mechanical properties of joints. Results showed that after heat treatment at 650 ℃, the mechanical properties of TA15 titanium alloy joints remained basically unchanged, while the mechanical properties of TC2 titanium alloy joints were slightly reduced after heat treatment. This is mainly due to the obvious recovery and recrystallization of the TC2 structure after heat treatment. The tensile properties of TC2 joints are better than those of the base metal due to the presence of the studs. Because the grain orientation of the joints is at a certain angle with the fiber direction of the original base metal, which is no longer perpendicular to the direction of the shear test force, the shear performance is higher than that of the base metal. But the 650 ℃ heat treatment has little effect on the mechanical properties of the joint. The tensile mechanical properties of the force perpendicular to the direction of the vertical bars are not significantly improved by only 2%, while the shear performance of the force perpendicular to the direction of the vertical bars is significantly improved by about 25%.