Hot-tensile behavior of C276 superalloy was studied in the deformation temperature range of 650~750 ℃ with the strain rate range of 0.35~35mm/s.The results show that deformation temperature and strain rate both have significant influence on the flow stress.The flow stress decreases with the increase of deformation temperature, while increases with the increase of strain rate.The deformation mechanism of C276 superalloy exhibit dynamic recovery feature in the case of deformation temperature 700℃.However, when the deformation temperature increases to 750℃, dynamic recrystallization behavior may be occurred.The flow stress of C276 alloy during hot deformation process can be characterized by Zener-Hollomon parameter including the Arrhenius term and the deformation activation energy was 327.66KJ/mol.Therefore, a scientific basis is provided for the reasonable choice of processing parameters of C276 superalloy.