The extended version of the journal was a component of the journal classification system. The journal was a series of scientific and technical journals sponsored by the Literature and Information Center of the Chinese Academy of Sciences (Library of the Chinese Academy of Sciences), including natural sciences, engineering technology, agricultural sciences, medicine and health, social sciences, humanities and arts, and many other disciplines. The extended edition of the journal was an extension of the classification of the journal, adding some new journals and updating the content and classification standards of some journals. The extended version of the CSSSCI journal included all the journals that were marked as "CSSSCI extended edition" in the CSSSCI journal classification system. These journals usually had higher academic value and importance. Therefore, the extended edition of the journal could be regarded as a part of the journal with the same important status and academic value.