If the expression new town is no longer in vogue in the discourse on urban policies of western countries, the reverse is true in the case of countries with strong economic growth and/or those called South countries. For twenty years, for reasons of various orders ads projects "new towns" are legion. In this profusion, Algeria and Morocco are no exception. In the mid-2000s, the moroccan ministry for town planning and housing announced the implementation of a program of "new towns" cash fifteen projects including one called Tamansourt, located in the outskirts of Marrakech. In Algeria, in 1987, the National planning scheme recommends the creation of new towns in the Hauts Plateaux and South. Meanwhile, "new towns", local emanation are launched, that is the case of Ali Mendjeli, near Constantine. Starting from the premise that the concept of new town " exceeded ˮ, we question the reasons prompting the algerian and moroccan public action to still be seized . Why do governments continue to use this type of development policy? This first question leads to two other complementary policies: how are they conducted and what are their territorial effects ? According to our first hypothesis , the performative and iconic efficiencies that intellectual representation, over their feasibility that have guided these options. Our second hypothesis is that there was no capitalization of foreign experiences in the context of redefining and adapting the concept. Studied acting arrangements do not fall under the urban planning or urban planning project , this statement is our third hypothesis. Our fourth hypothesis is that these actions are vectors more or less powerful reterritorialisation the outskirts of Constantine and Marrakech. It will check whether the emergence of centralities and/or new urban marginsis observable. We want to verify the idea of the existence of a wide gap between the "new town" ideational , that the project leader, and the "new town" lived , that is to say that the inhabitants of daily life.
