Abstract:Following the industrialization process of societies and fading public and urban social spaces, human has lost its original identity and became stranger to its life and environment. Like other phenomena, city is a dynamic organism that consists of components that plays a significant role in the life and its activity and each of those components participate when urban spaces needs to change and evolve. Public and collective space of a city is of paramount importance among different areas of the city. In a way that represents the social, cultural, economic and spatial complex values and needs to provide a place in which interaction and collective life in the city could be created. Such spaces have a mission to increase social capital in cities. Public space can also be a platform for developing and shaping identity. Considering the effect of urban public spaces in security, social stability and improving people's quality of life and considering this in mind that the real owners of these spaces are people, hence how much is the participation of each of the groups involved in the design process including employers, professionals (designers), governments and people?This study is practical in terms of aim and qualitative in terms of research nature which is studied based on grounded theory. Techniques of field observations, literature review and interviews are used in this study and by emphasis on the theories and principles of urban design, influencing factors on public spaces are studied and the factor of accepting people as the main users is emphasized as well and all aspects of people's lives must be considered in design and their participation is critical.