As an art form with reality as the core, how to make the audience have a sense of participation and play their subjectivity is a subject worth research and discussion. In recent years, under the rapid development and innovation of China’s TV documentary industry, excellent documentaries such as “A Bite of China”, “I Repair Cultural Relics in the Forbidden City” and “City 24 Hours” have been produced. However, it is undeniable that China’s documentary industry needs to improve more from the audience’s perspective to gain a higher national degree. Therefore, this paper studies the influence of the CCTV documentary series “City 24 Hours” on the audience’s subjectivity. This paper mainly studies the limitations of the documentary 24 Hour City in stimulating the subjectivity and making the audience produce “semantic democracy” for the narrative object. This includes serious labels, a lack of detail and engaging narratives, and even the mining and creation of traditional elements and online celebrity landmarks. The exploration of this series of problems and the implementation of countermeasures will be the only way in the development process of the documentary.