Abstract: Based on the analysis of application modes of geographic information system (GIS), the basic idea and characteristics of three-tiered architecture were presented, and an integrated application model for railwayGIS was proposed based on three-tiered architecture. Furthermore, the whole planning of railway GIS based on three-tiered architecture technologies was disscussed. An application system of railway GIS was developed usingMapObjects and C++Builder, and this system characterizes high efficiency, stability and expansibility. The application result shows that it is feasible to apply three-tiered distributed technique to railway GIS.