The design of the coating production line is an important stage in the preparation of the electrophoresis production line. It is a very creative design stage and a very complex problem. It involves the designer's industry knowledge, experience, inspiration and imagination . The scheme design includes several processes of design requirement analysis, system function analysis, and principle scheme design. This stage is mainly based on analyzing the needs, determining the electrophoretic technical parameters required to achieve the function and performance of the coating production line, ensuring the functional and performance requirements of the coating product, and performing preliminary evaluation and optimization of the technical parameters. According to customer requirements, designers use their own knowledge and experience to conceive an overall electrophoretic coating solution that meets design requirements.