Short video redefined the pattern of social networking in 2018，building many online popular cities. Short video plays an important role in shaping and spreading the city image. Scholars have commented on this phenomenon. Because of the lack of systematic analysis of short videos of the city，they rarely find out how to use the short video platform to tell the urban story. Tik Tok is one of the most popular short video platforms，so TOP 100 hot urban short videos from Tik Tok are selected to encode and analyze from two aspects of expression and content with content analysis method. It is found that urban short videos contain rich pictures of people and objects in the aspect of expression；vertical screen mode becomes the mainstream. Other traits of these videos like special effects，props and editing are little applied；audio video is the dominating video form and dialect is not popular. In terms of story content，there are many unique objects of the city featured with novelty，but the content is not deep enough in general. Finally，several strategies and suggestions will be proposed to improve the city image.