Real-time data sharing is a critical problem for land use data management under current network environment.Just as the XML is the standard criterion of information expression and data interchange for internet,GML,which is based on XML and developed by OGC,is the factual standard of the exchange,sharing and interoperability of spatial data in internet.Based on the national standard of GML 3.2.1,a GML application schema was designed for elements of land-use through the analysis of these elements and the relations among them.Based on GML and combined with C#,DOM and XPath,a inquiry system for land-use data has been developed.Under this system,many fundamental functions can be achieved such as the inquiry,displaying,browsing and publishing of land use data.The results and practice showed that GML can express land-use data better and facilitate the realization of land use data sharing.