Cemagref is a French public research institute in agricultural and environmental engineering. The first task of the 10 documentation departments of Cemagref is to provide solutions to the our engineers' information needs. The purpose of this communication is to describe various components of our information system, designed : to meet scientists' information needs, to provide a documentary survey, to develop a documentation section consulted through the Intranet network, to highlight the quality of Cemagref's scientific results. The development of these various services results from close and continuous communication between information professionals and researchers.