Abstract: The effects of cryogenic treatment temperature on the microstructure, Vickers hardness, residual stress, yield strength and tensile strength of GH2132 alloy were studied to explore the method to optimize the microstructure and improve the mechanical properties. It is found that, with the decrease of cryogenic treatment temperature, the grains of GH2132 alloy grow up obviously, and the carbide precipitates change from short rod-shaped phase to granular phase gradually. Vickers hardness increases first and then decreases, and reaches the highest of 392.2 HV at -150 ℃, which is 8.7% higher than that of at room temperature.The residual compressive stress on the surface increases with the decrease of temperature and reaches the maximum at -190 ℃, which is 360% higher than that of at room temperature.The yield strength and tensile strength change with the temperature in the same way. With the decrease of temperature, the yield strength and tensile strength gradually increase and then decrease, and reach the maximum value at -150 ℃. This study can provide reference value for microstructure optimization and mechanical properties improvement of superalloy materials, and also provide theoretical guidance for low temperature cutting of superalloy materials.