The KDC is the most widely used classification system in the elementary school libraries of Korea, but it is only published in full edition. This study is to development abridged KDC edition for elementary school libraries as the subject of KDC. In order to do this, the present writer carried out as follows; to analyse the present state of an class in KDC, to analyse a distribution chart of a class in an practical books and to comes up with a plan of abridged KDC edition as the grounding in the foundation of volume a collection of books. The abridged edition for elementary school libraries is a structural hierarchy of the corresponding full edition which it is based, and is intended for general collections of 20,000 titles or less.