Abstract: By testing the creep curves of DZ125 alloy under the conditions of 900 ℃/250 MPa, 950 ℃/250 MPa and 980 ℃/250 MPa and analyzing characteristics of the creep curves, testing its microstructure and microhardness, the influence of temperature on the alloy creep behavior was systematically studied. The results showed that as the creep temperature increased from 900 ℃ to 980 ℃, the creep rupture time shortened from 246.00 h to 7.75 h, and the steady-state creep rate increased from 0.004 5%/h to 0.224 4%/h. Cracks mainly originated from the recrystallized grain boundaries on surface and internal carbides, and under the combined action of temperature, stress and oxides, some surface recrystallized grains might detach from the surface. In the early stage of creep, the γ' phase in the microstructure might undergo N-type rafting perpendicular to the stress direction. In the later stage of creep, the rafted γ' phase experienced distortion and fracture. The longer the creep time, the more severe the distortion and the wider the channel width. Microhardness of the creep specimen was generally lower than that of the original specimen. However, for the specimen fractured at high temperature in a short time, its hardness actually increased due to the γ' phase being in the initial rafting stage. Therefore, when the stress on DZ125 alloy parts is approximately 250 MPa, the service temperature should not exceed 980 ℃.