Abstract : Our communication, based on a research in information communication sciences, try to discuss about the mergence of the online newspapers in Maghreb (Algeria, Morocco and Tunisia). Our ambition is to analyse the development of print newspapers to Internet and to clarify the specificities and the economic model of these media and cultural industries. We try to answer these questions: Does reading online newspapers actually substitute reading traditional newspapers? What's the economic model of online newspapers in Maghreb? What are the financial resources of these kinds of newspapers? Our studies expose that population, show that reading online newspapers harms using print newspapers among the young, but does not substitute the use of the print newspaper or other media or the time spent on them. On the contrary: Online newspaper readers use some information channels more often and more extensively, even after other plausible reasons for media use are controlled for. And they regard printed newspapers as still better suited for their information needs. Concerning the economic model of these media industry, we can say that online newspapers are based on the advertising and the resources of the print newspapers. Although subscription are forecast to constitute the future of online news publishing by the media executives interviewed, advertising still accounts for the majority of their online revenue. Actually, online newspapers in Maghreb countries are in the period of experimentation, their economic model and their readers are not stable and their stability will be clear in the long time and not immediately. To summer up, online newspapers are a prolongation and an association of print newspapers. Like the majority of online newspapers in the world, the content of these publications are similar than print newspapers, the mergence of economic model of these media can be evaluated with the audiences and the uses but in the long time.