论述了金矿综合信息预测知识库建造中所使用的知识抽取机制，即从专家知识源获取知识，表示为知识库形式的过程和方法。知识抽取是一个多任务过程，不仅要分析领域知识的特点及知识库的形式，而且还要进行相应的知识抽取任务分析及方法研究。本文章给出了一种抽取方法，为知识工程师对专家知识的抽取提供了良好的结构，并使所抽取的知识更有意义。该方法对分类型知识的获取具有一定的适用性。 Discusses the knowledge extraction mechanism used in the construction of the gold mine integrated information prediction knowledge base, that is, the process and method of obtaining knowledge from the expert knowledge source and representing it as the form of knowledge base. Knowledge extraction is a multi-tasking process, not only to analyze the characteristics of domain knowledge and the form of knowledge base, but also to carry out the corresponding knowledge extraction task analysis and methodological research. This article gives a method of extraction, which provides a good structure for knowledge engineers to extract expert knowledge and makes the extracted knowledge more meaningful. This method has some applicability to the acquisition of categorical knowledge.