This study suggests some ideas for the improvements of the classes of Language(700) and Literature(800) of the 4th Edition of Korean Decimal Classification(KDC). They includes some recommendations for the followings: introducing some new entries of the time table for the Korean Literature and English and American Literatures; relocating some entries for the improvements including language policy and administration; using new terminologies: adding new and revised notes for the appropriate entries; changing some specific classifying methods including the classification of bilingual dictionaries; introducing some options including those for the subdivisions of modern novels and those for American Literature; and discontinuing some entries not used, especially those in other Languages.