Research on Design and Implementation of Various Format Document Search Engine’s Index System

With the rapid development of Internet and computers,search engine appears as it is needed,more and more enterprises also begin to use computers to handle electronic documents.It has become a more and more important problem that how to retrieve the information users needed rapidly,conveniently and accurately from these network and various formats documents resources.But the index system is the coral technology,in order to improve recall and precision of the system,by describing index technology and retrieval model,an inverted index structure of 2d array of grouping database applied to document retrieval is designed,the database of index is constructed to reduce the complexity of the index organization effectively.Retrieval results are sorted,and optimal documents list is returned finally.The system is realized by using PHP development kits in windows environment.