Abstract: A general search engine usually suffers from returning to users too much unrelated information. To avoid these problems of general search engine, a subject-oriented vertical search engine is proposed in this paper followed by the introduction of the crawling strategy and the architecture of th is vertical search engine. Some distinctive characteristics of this search engine include:the system runs its core modules on multiples threads; a topic-related determination algorithm based on VSM is implemented in the system. The search eng ine system as well as its core algorithms is built upon lucene. Net. Experimental results show that the accuracy and recall rate of this system are higher than general search engine. Therefore, it is practically valuable and can be applied into more real applications.