Single crystal metal substrates have been used for the investigations of surfaces and adsorption kinetics of gas and many other kinds of materials. In order to people well-defined crystal surface, high accurate cutting from single crystal rods using X-ray technique, mechanical polishing and electrolytic polishing are necessary. In ultra high vacuum the single crystal surfaces are processed by use of several methods to obtain clean surfaces. In this paper, general metal surface processing techniques for obtaining clean surface are reviewed.