Thin wall TA15/Ti2AlNb dual alloy samples are prepared on the TA15 alloy substrate by using laser melting deposition technology. The microscopic structure and phase composition of as-deposited and heat treated TA15/Ti2AlNb dual alloy are analyzed, respectively, and the mechanical property of dual alloy at room temperature is tested. The results show that the as-deposited TA15/Ti2AlNb dual alloy possesses a good mechanical performance with a tensile strength of 1096 MPa, an elongation of 5.2%, and the fracture position is located in the transition zone. In contrast, as for the heat treated dual alloy, the tensile strength is 1053 MPa, the elongation is 3.2%, and the fracture position is located in the TA15 alloy side. As for the as-deposited TA15/Ti2AlNb dual alloys, the variation of the phase from the TA15 side to the Ti2AlNb side is in the order of α and β two-phase, α, α2 and β/B2 three-phase, α2, β/B2 and O three-phase, α2, B2 and O three-phase.