The problems in WEB data mining in regard to the high dynamism and complicacy are analyzed in this paper. On the basis of the analysis,the function of XML in web data mining is mainly discussed.

• 针对当前互联网发展的高度动态性和复杂性；阐明并分析了W eb数据挖掘中存在的问题；并在此基础上主要探讨了XML在W eb数据挖掘中所起的作用.