首先简要分析了几个经典的专家系统，然后针对专家系统的应用现状，按功能和应用领域进行了分类，并结合具体实例进行了说明。最后探讨了专家系统应用的发展方向。 First of all, a few classical expert systems are briefly analyzed. Then, the application status of expert systems is classified according to their functions and application fields, and the examples are given. Finally, the development of expert system is discussed.