▎ 摘　　要

NOVELTY - Preparing workpiece comprises coating reducing agent and laser protective liquid on the surface of the part to form a reducing agent coating and a laser protective coating respectively, where the material of the part includes first metal, polymercaptan compounds are included in the reducing agent, polyethylene glycol and reduced graphene oxide are included in the laser protection liquid, connecting part formed with the reducing agent coating and the laser protective coating with a substrate to form a composite body, and the material of the substrate includes a second metal, performing anodic oxidation treatment on the matrix in the composite to form an anodized film on the surface of the matrix, and laser treatment to remove the anodic oxide film in a predetermined area on the surface of the substrate to obtain workpiece. USE - The method is useful for preparing workpiece. ADVANTAGE - The workpiece has improved heterochromatic property. DESCRIPTION OF DRAWING(S) - The drawing shows a flow chart illustrating the method for preparing workpiece (Drawing includes non-English language text).