Chinese ancient books have many complex conditions with regards to their content and appearance. Descriptive cataloging of Chinese ancient books were started during the Han Dynasty and revised many times later on. Since the ISBD was published in 1971, the standardization of descriptive cataloging has influenced those of the Chinese ancient books. In Taiwan rare books have been included into the Chinese Cataloging Rules in 1983 as one of the types of records. On the other hand, the Bibliographical Description for Chinese Antiquarian Books was announced in mainland China in 1987. This article discusses the particularities and the description of the Chinese ancient books, the progress and the standardization of their descriptive cataloging, and their future cooperative online cataloging in the libraries of Taiwan.