Based on the study of the computerized automatic classification of Chinese sci-tech books,the article describes the design of a practical expert system for book clasification,the a practical expert system for book classification,the organization of expert experience in classification into a relational knowldge base and a methodology which integrates the rule system with a data management system.This methodology is not only able to manage the large-size rule system and share it
automatically, but also able to process dynamic data easily,making the system operate efficently.