Most cities in our country faced some problems such as physical disruption. These studies have been shown that the recent physical expansion of the city is because of the natural growth of the population, immigrations from villages and finally exceeding to farms and garden that located around the cities. In this research, we are looking for the most usable existing capabilities of Sanandaj by emphasizing on population structure and future needs to housing. The method research of this study is descriptive-analytic by using official data and urban development plan documents. In addition to applied methods for predicating the housing and population considering needs of housing in Sanandaj, population structure and the physical parameters of Sanandaj. Based on findings, infill lands and recycled lands of Sanandaj supporting all needs of housing services and horizontal development in mountainous cities with hard slope are unappealing for us.