This study creates a distributed system to automate the process of the inter-library cooperation and it speedups the interlibrary loan applications. DILCS (Distributed Inter-Library Cooperation System) combines the functions of Ariel document delivery and National Cheng- Kung University's interlibrary local management system. Web-based applications, mail delivery, scan document and related management requirements are integrated into DILCS. VB, ASP, SQL Server, Windows API (Mapi and Image scan) are the tools for the system development.