It aims to study the method of improving the quality of 3D Mapping. By learning from the research of visual illusion for art, architecture, environment, clothing and other fields, the characteristics of 3D Mapping and the influence of visual illusion on it are analyzed, the theory and application of 3D Mapping are found out. While analyzing the method of making 3D Mapping, it analyzes the common optical illusion in 3D Mapping, and focus on the depth illusion, the principle of anti perspective and the illusion principle of border illusion. It analyzes how these three visual illusions are applied in actual cases and how the visual illusion affects the 3D Mapping. The correct use of depth illusion, anti perspective principle, border illusion and other visual illusions can make visual depth change, good location correction and visual effect for 3D Mapping.