To digitize and innovate in China's zodiac heritage, the work aims to propose an intelligent design method that leverages cultural gene analysis and Prompt weight calculation for IP character regulation. Combined with deep learning technology and meme analysis, the analytic hierarchy process (AHP) was used to calculate the Prompt weight of intelligent generation design for Chinese zodiac IP character, and the Prompt weight was integrated into the Midjourney image generation process according to the priority. Then, fuzzy comprehensive evaluation was carried out through grouping experiments to test the effect. The method effectively adjusted the visual representation of zodiac IP character, aligning with cultural connotations and creating a cohesive series. The importance of human-machine collaboration and professional control should be emphasized when intelligent generation design tools are used. Based on the meme analysis of "subjectivity", "intersubjectivity" and "contemporaneity" in the zodiac culture, the creator can optimize the ranking and expression of Prompt more accurately, so as to adjust and control the IP character of the zodiac to intelligently generate design results, and drive the live transmission and sustainable development of the precious folk culture in the new era.