针对目前商用搜索引擎不能很好的满足专业用户的个性化需求的特点,提出建立一个专题搜索引擎,阐述了它的工作原理,并将它用于石油化工知识领域。该系统采用向量空间算法实现了面对石油化工主题的定向搜索,提高了系统的主题检索精度。另外,介绍了专题搜索引擎应用技巧或策略。 In view of the fact that the commercial search engine can not meet the personalized needs of professional users well at present, it is proposed to set up a special search engine, explain its working principle and apply it to the field of petrochemical knowledge. The system uses the vector space algorithm to achieve the directional search of the petrochemical subject and improves the accuracy of the system’s thematic retrieval. In addition, the introduction of the topic search engine application skills or strategies.