Abstract: 【Purpose/significance】This study explores the factors influencing audience comment emotions and their projection effects in short videos on sudden online public opinion events. It focuses on how videos with different attitudes evoke emotional responses in comments and their projection impact, aiming to provide theoretical and practical guidance for public opinion management.【Method/ process】Based on the theories of emotional contagion and Stimulus-Organism-Response (S-O-R), this research employs a multiple regression model to examine the impact of short video attitudes on comment emotions and investigates the moderating roles of public opinion responses and media framing in this emotional effect. Additionally, Social Network Analysis is used to explore the projection effect of short videos on audience emotions.【Result/conclusion】The results indicate that the attitude of short videos in sudden online public opinion events significantly influences the emotional tone of comments. Positive-attitude short videos promote the spread and concentration of positive emotions in comments, while negative-attitude short videos trigger negative emotions. When the short video includes public opinion response content, positive-attitude short videos lead to an increase in positive emotional comments, while negative-attitude short videos mitigate negative comments. The subjective media framing weakens the promoting effect of positiveattitude short videos on positive emotions, but has no significant moderating effect on the emotional impact of negative-attitude short videos. Social network analysis shows that short videos have a projection effect on comment emotions, and there are differences in the emotional propagation and projection effects of short videos related to sudden online public opinion events with varying emotional tones.【Innovation/limitation】This study broadens the applicability of the S-O-R theory in the field of emotional transmission and opens up a new direction for exploring the internal logic of user comment behavior.