The Ti2AlNb forging sample used for internal combustion engine was selected as the test material. The powder feeding laser additive treatment was applied to the sample. The microstructure characteristics of cladding under different laser energy densities were tested, and the mechanical properties of the bonding zone of samples were analyzed. Results show that when the linear energy density is 100 J/mm, the microstructure of lower substrate is the same as that of the forged substrate. There are β columnar crystals in the apical region that penetrate into the sedimentary layer. There are two α phases in the lower region, i.e., equiaxed and lamellar. There are equiaxed and lamellar α phases in the middle part, and secondary α phases in the β phase. The number of α phases increases with the increasing of linear energy density. There are α lamellar structures in the β grains. When the linear energy density is increased, the tensile strength and yield strength decrease, while the elongation increases. When the linear energy density is 100 J/mm, the microstructure of the bond zone with the best mechanical properties is formed, and the maximum tensile and yield strength is obtained. There are shear lip and dimple morphology in the tensile fracture of the specimen, and the ductile fracture occurs.