The aim of this article is to study the information infrastructure of governmental banks in Tehran city to suggest an information network for them. The relevant libraries were studied with respect to equipments, resources, personnel, and, cataloguing, classification and retrieval system. This research as a descriptive- applied study, has used survey method for which the required data were collected by a checklist. Research population included libraries of 12 governmental banks situated in Tehran city that are active in subject areas like Economics, Money and Banking.Results of the survey revealed that target libraries are in different levels in terms of strengths and weaknesses. The main problems in these libraries are shortage of space, shortage of specialist personnel and varied organizational positions. Also, some of them have rich collections while others don't. To solve these problems and make provisions for effective use of resources and information' services, it is suggested to establish an information network for these libraries. Considering conditions and situations of the libraries, the most suitable topology for the proposed network is a compound topology in which some network functions like bibliographic control, referral services and educational services are performed as centralized by the Central Bank Library, and some other functions such as current awareness services and interlibrary loan, will be rendered as decentralized by each library. Also, some suggestions are made for extending the network services.