Interactive design is an information expression of people, products and services, which is widely used in modern media design. It is particularly important to enhance the interactive innovative design of dynamic posters. This paper aims to study the interactive design mode of dynamic posters through interactive mode, design innovation and creative expression. On the basis of exploring the characteristics, advantages and disadvantages of dynamic poster design, this paper analyzes and studies the interactive characteristics of dynamic posters from the perspective of new media, and creatively expresses by combining visual language expression, spatial logic architecture and interactive fusion design; it provides the dynamic poster design ideas for Chinese calligraphy rings, further summarizing the design approaches and interactive design methods of dynamic posters. The practice of this design mode will provide guidance and reference for future poster design, and the methods can promote the diversified development of dynamic poster design.