<p>Laser deposition repair technology has been used to repair the damaged TA15 titanium alloy forgings. Heat treatment is used to control the microstructure, strength, and plasticity of these repair forgings. Through the analysis of strain changes, the performance changes of repaired parts after heat treatment were further studied. In this paper, the microstructure of TA15 titanium alloy repaired by laser deposition with different heat treatments was observed by optical microscope and analyzed its microstructure changes. Then, the hardness of TA15 titanium alloy repaired by laser deposition was detected, and finally the strain during the tensile and fatigue process of TA15 titanium alloy repaired by laser deposition was detected by DIC system, and the cause of its change was analyzed. The results show that the hardness of the specimen after heat treatment at 950&#xa0;°C is the highest. The tensile properties are mainly affected by the repair zone, and with the increase of heat treatment temperature, the proportion of the base metal area increases. With the increase of the applied force, the strain concentration area at the working end of the fatigue specimen is transferred from the inside to both sides, and the strain in the fatigue process is S-shaped as a whole, which is composed of three parts: rapid accumulation, steady growth, and rapid failure.</p>