Abstract: 【 Purpose/significance】 To explore the characteristics of social interaction behavior of bullet screen users, on one hand, to help video websites understand the characteristics of bullet screen users' behavior, attach importance to the filtering and guidance of bullet screen; On the other hand, it helps creators of food production videos to understand the user's interactive behavior tendency, set the situation reasonably, and improve the quality of video content【. Method/process】 30 food production videos were selected from the food area of Station B, and the features of user interaction in terms of time, quantity and text were statistically analyzed. Emotion analy⁃ sis and subject word analysis were used to explore the features of user interaction content, and the following behaviors among users were analyzed through social network graph.【 Result/conclusion】 Bullet screen users tend to have social interaction during lunch, din⁃ ner and early morning, and the peak value of bullet screen is formed with the occurrence of interactive situations. The emotional ten⁃ dency of bullet screen users is related to the content expression and emotional transmission of video creators. When interacting with video creators, bullet users often use "I" or "we" as the main language or communicate with creator ID. Bullet users tend to look for people with common ground or similar experiences. The interactive content of "active users" has the characteristics of high degree of topic integration, and the characteristics of secondary creation of followers are obvious.【 Innovation/limitation】 This paper focuses on the social interaction behaviors of bullet screen users, explores their behavioral characteristics from multiple dimensions, and innova⁃ tively integrates bullet screen text analysis with food production video. Follow-up studies can further expand the sample size and re⁃ fine the video classification.