Abstract: Taking the die-casting 7085 aluminum alloy as the research object, three kinds of processes were used for thermal compression deformation.Optical microscope (OM) was used to observe and analyze the microstructure of hot compression deformed samples, and electronic universal testing machine and scanning electron microscope (SEM) were used to test the mechanical properties and fracture behavior of samples under different processes.The results show that the microstructure of the alloy is quite different after different passes of deformation.After a single pass of large-strain deformation, the structure of the alloy has no obvious recrystallization, and it is in work-hardening state.The deformation mode of multi-pass small strain accumulation can stimulate a small amount of static recrystallization.The yield strength and tensile strength of the material after single-pass isothermal compression are higher, which are 402.6 and 480.7 MPa, respectively, and the elongation at break decreases from 11.3% of as-cast to 9.3%.After the solution treatment, the microstructure uniformity of the material is obviously improved, and the best comprehensive mechanical properties are obtained by single-pass isothermal compression, the yield strength is reduced to 348.0 MPa, and the elongation after fracture is increased to 20.9%.The fracture changes from intergranular fracture to transgranular fracture.