With the deep integration of culture and tourism，the importance of library in cultural tourism has become more obvious. This paper takes the comment text of library of Ctrip as the data source，analyzes the main image factors of library perceived by tourists using the informetrics methods，and describes the library image in the eyes of tourists. Based on research methods of grounded theory，this paper constructs a library image model through three-level coding of comment text of library. This research finds that the library presents the image of "beautiful building，free admission，rich collection of books，quiet reading room，worth visiting" in the eyes of tourists. The library image model consists of 4 core categories，9 dimensions and 51 nodes. In order to further optimize the image of the library，it is necessary to build the cultural brand of the library，provide immersive tourism experience，broaden the image communication channel，and build the cultural and creative IP of the library.