Herewith, the indentation creep of Sanicro25 steel was assessed via an indentation creep test set with a flat-ended cylindrical indenter of 1 mm in diameter in temperature range of 973-1073 K, and stress range of 273-765 MPa. The results show that: with the increase of temperature and stress, the steady state creep rate is increasing; according to the steady state power relationship, the average stress index is deduced to be 3.6, and the activation energy 257-295 kJ/mol, which are in good agreement with those acquired from the uniaxial tensile test. It follows that the indentation creep test can reliably characterize the creep behavior of alloys. The surface of the tested steel presents typical characteristics of plastic deformation accumulation, which may be ascribed to the material flow that occurs beneath the pressure indenter in the fully plastic region along the axial direction; There existed three characteristic deformation zones beneath the indenter, in one of the three zones, the grains exhibit significant preferential orientation deformation, which verified the creep mechanism dominated by dislocation migration.