We examine discussions surrounding China-U.S. relations on the Chinese and American social media platforms \textit{Douyin} and \textit{TikTok}. Both platforms, owned by \textit{ByteDance}, operate under different regulatory and cultural environments, providing a unique perspective for analyzing China-U.S. public discourse. This study analyzed 4,040 videos and 338,209 user comments to assess the public discussions and sentiments on social media regarding China-U.S. relations. Through topic clustering and sentiment analysis, we identified key themes, including economic strength, technological and industrial interdependence, cultural cognition and value pursuits, and responses to global challenges. There are significant emotional differences between China and the US on various themes. Since April 2022, the Chinese government has implemented a new regulation requiring all social media accounts to disclose their provincial-level geolocation information. Utilizing this publicly available data, along with factors such as GDP per capita, minority index, and internet penetration rate, we investigate the changes in sentiment towards the U.S. in mainland China. This study links socioeconomic indicators with online discussions, deeply analyzing how regional and economic factors influence Chinese comments on their views of the US, providing important insights for China-U.S. relationship research and policy making.

翻译：本研究考察了中国和美国社交媒体平台抖音（Douyin）与TikTok上围绕中美关系的讨论。这两个同属字节跳动（ByteDance）旗下的平台在差异化的监管与文化环境下运行，为分析中美公共话语提供了独特视角。通过对4,040条视频及338,209条用户评论进行分析，本研究评估了社交媒体上关于中美关系的公众讨论与情感倾向。通过主题聚类与情感分析，我们识别出包括经济实力、技术与产业相互依存、文化认知与价值追求、以及应对全球性挑战在内的关键议题。中美双方在不同主题上存在显著的情感差异。自2022年4月起，中国政府实施新规，要求所有社交媒体账号公开其省级地理位置信息。利用这一公开数据，并结合人均GDP、少数民族指数及互联网普及率等因素，我们探究了中国大陆地区对美国情感态度的变化。本研究将社会经济指标与网络讨论相关联，深入分析了地域及经济因素如何影响中国用户对美观点的评论，为中美关系研究与政策制定提供了重要参考。