Abstract: In this part of analytical study on the Ksar of Bou-saada, we examine the mode of urban land in the form and in content, in terms of the urban structure, from one-time items (plots and crossroads) or linear (streets, alleys and dead) and their relationships as part of liaison with the construction. Then, we turn to the analysis of networks of public facilities and green spaces of Ksar to infer. Finally, the constant principles and content of this spiritual ksar order to take them as building blocks in the urban planning residential areas and this within a framework that ensures on the one hand the requirements of present and future generations and on the other hand, takes into account these constants as starting points for the occupation of urban land with historic dimensions cultural, social, economic and environmental issues of authenticity, to ensure sustainable development.