GH80A has been widely used in industry for its excellent property under high temperature. The surface integrity is one of the key factors that determine the lifetime. Hence, it’s worth to study surface topography and residual stress which are two important indexes used for evaluating the surface integrity. They are both resulted from the coupling of the mechanical and thermal effect during the turning which can not be well explained with experiment and numerical calculation. In this paper, workpiece surface topography was studied under different cutting parameters. The residual stress is measured and simulated to show more details about the effect of cutting parameters. The cutting temperature which is difficult to pick up in experiments is also simulated to explain the machining process.