In order to improve the comprehensive mechanical properties of Ti-1.5Al alloy plate for piano silencers, the tension test for impulse current-assisted Ti-1.5Al alloy was conducted, and the mechanical properties of Ti-1.5Al alloy plate prepared by different impulse current densities were compared. Then, the microstructures and the micro morphologies of fracture area formed after tensile were characterized. The results show that when the alloy material is subjected to impulse current, its plasticity becomes stronger, and its strength decreases obviously. With the increasing of impulse current density, the alloy obtains greater elongation, lower mechanical strength and more uneven deformation. The reason is that when the impulse current density increases, the temperature also rises causing obvious deformation in the middle part. The microstructure at necking part when the alloy is stretched is mainly composed of two-phase titanium alloy with white structure α phase and part of β phase precipitated at the grain boundary of α phase. With the increasing of impules current density, the alloy temperature rises rapidly, which causes the alloy phase transition. In addition, the dimples of different sizes are formed in the fracture area, which is manifested as ductile fracture, and the larger dimples are formed by applying impulse current, which undergo obvious plastic deformation.