Vertical search engine has always been a hotspot in the study of searching technique. Dispite a wide range of applications, the mainstream method of vertical search engine still has several flaws. In many cases, only a few stages have been optimized in the construction process of vertical search engine. Also, when obtaining information from websites, most of the methods require manual configuration, which is cumbersome. Based on an in-depth study of the vertical search engine technology, this article presents a method that uses JAVA open source tools such as Heritrix, Solr, combined with the extraction algorithm of web content and integrity word for automatically constructing a vertical search engine. In addition, the article examines the key issues in the various stages of the method's implementation and puts forward the corresponding optimization plan, which are examined to have strong practicality.