<p>Due to the large volume of aviation die forgings, the load required in the die forging process is large, and it is easy to have problems such as incomplete mold filling and uneven tissue distribution. Therefore, reasonable forming parameters are particularly important for ensuring the quality of forgings. In this paper, the high temperature die forging process of GH4169 alloy low pressure two-stage turbine disk forging is taken as an example. The constitutive model of the material is established by the Gleeble hot compression experiment, and the influence of temperature, die forging speed and under-pressure on the forming effect of forgings is studied. The results show that: (1) When the strain rate of the material is 1 S⁻¹, there will be a serious work hardening phenomenon, which increases the forming load and the stress of the die. (2) The maximum forming load of forgings can reach about 300 MN. Underpressure forging is an important way to reduce the forming load of large die forgings and improve the accuracy of forgings. (3) The optimum parameters of forgings are die forging temperature 1000 °C, die preheating temperature 300 °C, underpressure 5 ∼ 10 mm, upsetting speed 45 mm/s, die forging speed 12 mm/s or strain rate 0.1 S⁻¹.</p>