With the development of globalization and screen media, dynamic bilingual posters have become an important form of information communication. Against this background, this paper explores the narrative expression of dynamic bilingual posters based on the grid system. In combination with literature and case analysis, four grid system architectures for dynamic bilingual posters are proposed. Starting from the four aspects of information arrangement method, media scale, narrative logic and viewing experience, the application methods of grid systems in dynamic posters is studied. Combined with design practice, the research content is supported and improved. When dynamic and screen media are used first, formulating a suitable grid system in advance can make the picture have stronger visual expression and make the narrative and information transmission of dynamic posters more coherent. The application of the grid system in combination with sound, media and on-site experience can better play the advantages of dynamic media, make the grid efficiently serve the picture, and realize the complementary relationship between cultural narrative and visual communication.