Abstract: The data of Digital Line Graphics(DLG) are the most important and widely used basic geographic data in the survey and design of railways. How to store and manage the DLG data efficiently was the key and difficult point for the construction of Fundamental Geographic Information Management System. Using VB.NET and ArcGIS Engine as development tools, adopting ArcSDE and Oracle as data server to store and manage spatial data, DLG Data Loading System was developed successfully, DLG data can be bulked, layered and loaded into spatial database automatically and rapidly.