This paper addresses the challenge of high-performance repair for thin-walled aeronautical TC1 structures by investigating the pulsed-laser additive manufacturing process for repairing thin sheets and lattice structures. The repair quality was assessed through microstructural and macrostructural analyses, as well as tensile tests on TC1 sheets and compression tests on aeronautical lattice structures. The results showed that the repair area shows good metallurgical bonding with the substrate under the conditions: laser power of 600~1 000 W and pulse time of 100 ms. Higher volume fraction of finer α′ martensite structure can be obtained, becaused of the high temperature gradient during the repairing process by a pulsed laser. Moreover, the tensile strength and yield strength of the thin plate specimen after laser repairing are slightly higher than those of the forged specimen, while the elongation decreases to a certain extent. When subjected to simulated compression test, the maximum average damage force of the sample after pulse repairing is increased from 2.5 kN to 3.58 kN.