Abstract : The rational exploitation of the results of scientific research depends initially on the access to these results. It is from this principle that emerged the movement of the open Archives in the research field in order to preach an open and free access to the world's scientific literature. The control of this movement, its principles, its techniques....is the main theme of this study which proposes to define a prototype of institutional and multidisciplinary Open Archive (CERIST of Algiers) for the Algerian scientific communities. To achieve this goal, we have, in a first time, made a recall on the origins and the evolutions of the movement of the open Archives in the landscape of the scientific communication. Afterwards, we have studied some Open Archives in order to grasp their experience by their modes of organization and operation in the realization of our prototype of open Archive which we have named ArchivAlg. Then, we have exposed in a constructive approach the steps of creation and realization of our prototype. In the end, we have proposed some prospects for the promotion of free archiving in Algeria.