Abstract: To explore the flame correction temperature interval of TA3, the heat treatment of TA3 was carried out by using 500-1000 ℃ heat preservation and then air cooling, and the effects of heat treatment on the microstructure, mechanical properties, and corrosion performance of TA3 were systematically studied. The results show that its microstructure is almost unchanged below 800 ℃, and the grains grow slightly; at 900 ℃, the microstructure becomes coarse jagged α-phase, and at 1000 ℃, the microstructure is Widmanst a tten structure. The hardness, modulus of elasticity, yield strength, tensile strength drop to the lowest value at 900 ℃, and the elongation is the opposite. Ductile fracture occurs mainly when the heat treatment temperature is lower than 900℃, and the composite fracture mode with ductile and brittle fracture at the same time occurs at 1000 ℃. The corrosion resistance of the substrate is best, and the corrosion resistance at 900 ℃ is worst. Based on the above research results, the flame correction temperature range of TA3 is determined to be 500-800℃.