JavaKBB,an expert systems tool,is described and the central idea of the project is to make an easy-to-use and easy-to-extend tool for building practical expert systems.It can simultaneously represent conceptual knowledge and procedural knowledge of domain;which can run on commercial operating systems such as Windows along with military domestic operating systems such as NeoKylin.This study presents a knowledge representation model of integrating frame with production rule,which defines five levels of abstraction in order to design an expert system,including knowledge primitives,knowledge units,knowledge elements,knowledge base and knowledge systems.Based on this model,JavaKBB was designed and implemented with Java language.Another important feature of JavaKBB is its capability of saving knowledge bases in XML format,thus making them potentially easy to interoperate with other knowledge bases on the Internet.Currently,JavaKBB has been used to build the Chronic Hepatitis Prophylaxis and Treatment Expert System and the Equipment Decision Support System.%描述了一个专家系统工具JavaKBB，其目标是设计一个容易使用、方便扩展的专家系统开发工具，可以同时表示领域概念知识与过程知识；既可以运行于商用操作系统Windows等，也可以运行于中标麒麟等军用国产操作系统。为此，提出了一种集成框架与产生式规则的知识表示模式，定义了五种抽象层次以设计一个专家系统，包括知识原语、知识单元、知识部件、知识库以及知识系统；在此基础上基于Java语言设计并实现了JavaKBB。JavaKBB的另外一个重要特征是它能以XML格式保存知识库，具备与其他知识库进行交互的潜力。目前，JavaKBB已经用来构建慢性肝炎防治专家系统、装备辅助决策系统等。
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