Abstract: With the rapid development of GIS and Internet technologies, E-government system based on GIS has gradually become a necessary component of the informatization construction of governmental departments. However, various forms of stored geographical information make it difficult to exchange and share the information. Geography Markup Language (GML) has effectively promoted the integration of various geographic data sources and is therefore widely used. Meanwhile, great importance should be paid to the security issues it has brought in its wide application. The authors proposes using the encryption and digital signature to ensure the safety during GML transmission and set up a secured WFS concept and the corresponding architecture, which have been successfully applied in a specific project development.

Key words: GML(Geography Markup Language), WFS (Web Feature Service), XML (eXtensible Markup Language), encryption, digital signature