Listening to young children’s voices is crucial to improving children’s library services. The first step is unveiling how young children think about the library. Thus, researchers recruited the Mosaic approach including photography, interview, and drawing to explore the features of children’s libraries in children’s perspectives in six libraries in China. The results indicate that first, the children’s library is a “primary third place”. Second, the children’s library is an overlapping of home and society. Third, children can read books in the children’s library, but not just read. Fourth, the children’s library improves children’s awareness as patrons. It is suggested that young patrons already form initial understandings of the library, begin to complain about any problems, and put forward requirements for the library. Additionally, their interpersonal needs should be paid attention to. Therefore, librarians and researchers should respect the rights of children and listen to their voice when designing and providing library services associated with children.