Abstract: In recent years, with the popularity of online video, more and more people are using video as an important channel for information acquisition, and used bullte comments to express their perception and emotional evaluation of video information in real-time, which is particularly evident in tourism videos. The viewing of tourism videos can be seen as a non physical tourism experience scene to a certain extent, while bullte comments information is a real-time and dynamic evaluation of this tourism experience, which contains rich and authentic multidimensional tourist experience information. Taking Aerial China, a domestic influential tourism documentony series, as an example, this paper focuses on the real-time and dynamic nature of bullte comments, excavates the tourist perception characteristics and emotional characteristics implied in the bullet screen information, and then explores the correlation and its mechanism under the dynamic evolution of video. After in-depth mining and analysis of 4355 barrages extracted by Python, it is found that the perception characteristics based on tourism video bullte comments can be divided into three dimensions: intuitive, extendable, and participatory. Each main dimension can be divided into multiple sub dimensions. As the video evolves over time and the theme changes, it can be divided into different dynamic intervals, and there are significant differences in perceptual dimensions and their changing trends in different intervals; bullte comments can represent obvious emotional tendency. After quantitative analysis of emotional intensity and trend, we further found that there is a significant correlation between perceptual characteristics and emotional tendency and its correlation mechanism. On the basis of fully considering the real-time and dynamic nature of the barrage, this paper innovatively explores the characteristics of tourists’ perception and emotion and their changing trends under the dynamic evolution of video, providing a theoretical framework and method demonstration for the analysis of barrage, a relatively new tourism text information, and also providing scientific guidance for tourism videos on how to better meet the needs of tourists’ experience, thus improving the value of tourism marketing.

Key words: perceptual features, emotional connection, dynamic evolution, video barrage, text analysis, urban tourism destination