The essay analyzes the main shelving systems comparatively from three aspects including shelving methods,the distinguishing of the same kind of books and the disposing of holding information under online cataloguing environment,aiming to give the information organizations such as libraries some helpful message to develop the most appropriate shelving system of the collections.

To counter such an evidence,more attention should be paid to biblionthetic standardization as well as re_editions of Chinese Library Classification so as to prevent homobiblion with heteronuméro at all angles.