Abstract: KZ1/ZG is a knowledge base management system (KBMS) which cooperates with the expert system KZ1/RZ to support the intelligent man-machine communication of operating systems. In this paper, we first describe the two classes of knowledge- natural language knowledge and operating system knowledge, and their representations, and then present the architecture, functionality, and implementation of KZ1/ZG in detail.Finally, some conclusions of our research are given.