This paper first introduces the background of knowledge discovery and depicts the development of it as well as the knowledge type and database used in knowledge discovery. After that it introduces the application of knowledge discovery in various areas: agriculture, medicine, environmental protection, chronometer, finance, retail, military and Internet.%介绍了知识发现的背景，描述了知识发现的发展过程、知识类型、所使用的数据库，重点介绍了知识发现在各个领域的应用如：农业、医学、环保、天文、金融、零售、军事、Internet等。
展开▼
