C-dramas are launched on YouTube platform, and the update speed overseas is the same as that at home. Overseas audiences can understand costume dramas through language symbols, star symbols, and they love costume dramas more than modern dramas. They have the ability to share joys and sorrows with film and television characters. The viewing of costume dramas leads to Chinese fever and star chasing behavior. In order to better spread costume drama, it can create contact opportunities for overseas audiences within the acceptable range of culture, reduce the cultural inaccuracy part of costume drama, provide background knowledge and provide quality dramas. Film and television works are an important way to tell Chinese stories. Story-based communication makes overseas audiences willing to learn about Chinese culture and history through film and television works. Swordsmen film is a folk hero myth in the Chinese world, similar to western cowboy in the United States and Bushido in Japan. Swordsmen films is the most complete in China film, and the most national characteristics of film type.In terms of TV dramas, costume dramas are rooted in traditional Chinese culture, displaying rich Chinese elements and carrying cultural symbols such as Chinese history, mythology, classical Musical Instruments, traditional costumes, architecture and Chinese food. They are unique types of dramas attracting overseas audiences with distinctive national characteristics.With the open, convenient, timely and effective features of the Internet, Chinese films and TV series have been released on overseas network platforms such as Netflix and YouTube, changing from passive communication to active communication. On YouTube, film and television organizations with copyright have opened channels to upload Chinese films and TV works.This study takes Tencent Video as the research object to analyze what efforts the online video platform has made for the spread of costume dramas? What are the comments of international audiences? How to improve the overseas communication effect of costume dramas?