[Purpose/significance] The red theme library is of great significance in the construction of red discipline and red culture. This paper takes the construction of the CPC History and Literature Center as an example to explore the theory and practical path of the construction of the red theme library from the perspective of media ecology. [Meth⁃ od/process] Using literature research method and content analysis, the library construction element framework was constructed from the perspective of media ecology. On this basis, the authors analyzed the user needs of red theme li⁃ brary, investigated the construction status of the red theme libraries, put forward and implemented the media construc⁃ tion path of red theme library. [Result/conclusion] Library media environment includes three elements: resources, space and technology. The media construction of red theme library should integrate multi-modal resources and nest physical and digital space to build an immersive media environment which balances users’senses.