The stress-strain curves of aging-strength Fe-Ni based corrosion-resistant alloy were obtained by the hot compression test under conditions of temperature 900-1200 ℃(50 ℃ increments per test), strain rate 0.1 s-1 and strain 35%. The stress-strain curves vary greatly at different temperature. The peak compression stress decreases gradually with the increase of temperature, and the decreasing tendency is gradually retarded. After testing, the hardness of samples also decreases with the increase of temperature, however, the microstructure keeps its original cast structure with dendrite. When the test temperature is lower, the recrystallization grain is smaller, and it is more obvious with increasing temperature. Therefore, the tiny recrystallization grain increases, and the recrystallization fraction is far from the complete recrystallization. When test temperatures are 1150 and 1200 ℃, intergranular cracks are found in the micrograph, and it is related to over high temperature or over large single-stroke deformation.