Abstract：Emotional state representation and detection method of users in library space based on body posture recognition Purpose In the information commonsICspace of libraryit is very important to recognize the emotional state of users for better playing the role of ICIn view of this pointthis paper aims to discuss the human expression of user emotionDesignmethodologyapproach An emotional state recognition method based on body posture change under video monitoring is proposedIn this methodtwo parameters are proposed to represent the emotional state of usersFinallythe distribution of usersoverall emotional state is recognizedFindings It is found that the change of human posture reflects the emotional state of users to a certain extentThe spatial frequency of the users average body position change and per capita body position change can reflect the spatial distribution of individual and body position changerespectivelyOriginalityvalue The method in this paper can effectively overcome the inaccuracy of manual identification of video monitoring imagesespecially in the case of a large number of users and effectively help the construction of university library IC space and provide a basis for the setting of environmental parametersLibrary AutomationandConsulting ServiceAI is mainly used in the information of the Librarys Information CommonsICto identify the emotional state of the userso as to better play the role of ICThis article refers to an emotional state recognition method based on video surveillance based on physical changeswhich involves pattern recognitionespecially to identify changes in human posture and emotion from the video