Aiming at the need of edge damage repair of thin wall parts of TC17 titanium alloy, the laser deposition repair test of TC17 titanium alloy damage specimen was carried out by using TA15 titanium alloy powder. By optimizing the process parameters, the less penetration and no defect repairing specimen was obtained. The microstructure, tensile properties and hardness distribution of laser deposited specimens were studied. The results show that the microstructures of the repair zone of TA15 are coarse columnar β crystals, α / β basket structure in grains, α lamellar orientation is random, compared with the TC17 substrate, the α lamellar structure in the heat-affected zone appears to be refined,the aspect ratio is improved. The tensile strength of the repaired specimens at room temperature reached 90.2% of that of the TC17 forgings, which was 10.6% higher than that of the TA15 forgings, the elongation after break is 4.3%, slightly lower than that of TC17 and TA15 forgings. The microhardness of the heat-affected zone was slightly higher than that of the substrate and the repair zone of TA15, which was lower than that of the TC17 substrate and higher than that of the TA15 forging hardness.