Against the backdrop of profound changes in the global economic and trade landscape and increasingly complex communication environment，as an important platform for global economic and trade cooperation，the international influence of the China International Import Expo（CIIE）continues to increase. This study uses the cutting-edge Transformer model in natural language processing，combined with spatiotemporal analysis methods，to systematically examine international media coverage and social media data during the 7th CIIE. Analysis shows that the dissemination of the CIIE exhibits regional differentiation characteristics，with a significant increase in dissemination activity in the Asian region. Among them，the media coverage in Malaysia has increased by more than 60%，while there is a mismatch between the scale of exhibitions and the popularity of coverage in Europe and America. In terms of content dissemination，the proportion of cultural themes has significantly increased，and technological innovation content has attracted widespread attention. Research has found that the communication mode of CIIE is undergoing a profound transformation，shifting from short-term centralized reporting to long-term value dissemination，and from single information transmission to diversified narrative co construction. These findings not only provide practical references for improving the dissemination effect of international exhibitions，but also provide important insights for the global dissemination of Chinese stories in the new era. The research suggests further enhancing the international communication efficiency of the CIIE by optimizing the layout of the communication network，innovating the application of digital technology，and improving the effectiveness evaluation system.