GH4169 nickel-based alloy material with a plate thickness of 5 mm was subjected to high-temperature tensile experiments at seven test temperatures (450~1 050 ℃ ) and strain rates of 0.01 and 0.001 s -1 , respectively, using high-temperature tensile equipment in a furnace. The elongation, yield strength and tensile strength of the material at different temperatures were obtained, and the high-temperature tensile deformation behavior was analysed, which provided data support for the preparation of high-temperature tensile forming and service performance evaluation of the alloy sheet. The results show that when the strain rate is 0.001 s -1 and the temperature is higher than 850 ℃, the elongation of the GH4169 nickel-based alloy plate continues to increase with increasing temperature and reaches up to 112% at 1 050 ℃. The tensile strength decreases to 66 MPa with increasing temperature, which is only 7.1% at room temperature. When the strain rate is 0.01 s -1 , the elongation and tensile strength changes of the GH4169 nickel-based alloy sheet have similar trends. When the temperature is lower than 800 ℃ , the elongation and tensile strength do not change much with temperature, and a high strength is maintained. However, when the temperature increases to 850 ℃, the material has an obvious softening phenomenon, the strain hardening index n value decreases with increasing temperature, and the plastic deformation increases significantly.