The major research work and contributions of this dissertation are as follows : ( 1 ) the basic theory of focused searching and the construction modes of web subject resources are investigated respectively . based on these investigations , the thesis explores the related techniques of automatic focused searching and brings forward a functionality framework for automatic construction of web resource 本论文的研究工作主要包含以下四个方面: ( 1 )研究了主题搜索的基本理论和web主题资源的建设模式,探讨web主题资源自动搜索的相关技术,为自动主题搜索提供一个可行的研究方案,设计出一个web主题资源自动建设的功能框架; ( 2 )分析和实现了一个新型的多模式字符串匹配算法。