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XML has been becoming the de facto standard for data exchange on the World Wide Web. Now, while XML data files are become more, people have developed a variety of storage methods of the XML file, such as the use of relational databases, native XML databases, and so on. Meanwhile, people have a higher demand on the technology to efficient processing of large XML data sets, now the main direction of research is XML index technology, on the one hand, the twig matching process is more important. Many researchers have done a lot of research in this area. This paper proposed an XML Index Cache designed to improve the efficiency of matching XML indexes, including the simple path matching and twig matching. This paper also presents the structure of XML Index Cache technology and related algorithms. Finally, we do the experiments in CoSQL RX 1.0 that is dual engine database system which was independently developed by the laboratory of Peking University.