The cover is an important part of the art of binding. It is like an overture to music and a guide that brings readers into the content. In addition to designing, feel the charm brought by design, feel the worries brought by design, and feel the joy of design. In cover design, you can follow the modeling rules of balance, rhythm and harmony, highlight the theme, boldly imagine, and use knowledge of composition, color, pattern, etc. to design a more perfect, typical, and emotional cover, and improve the ability of design application.