This research seeks the role and effect strength of accessibility and vitality on urban spaces. Urban space is a phenomenon organized by information manifested in various forms, functions and meaning. It is the context of forming and improving social life, representing culture and urbanization of a culture. According to desirable cities, it is deliberated that the cause of this magnificence is their lively and vibrant urban spaces. Regarding this point, weak social interaction of people and lack of optional and social activities in cities of Iran is clearly observed. This issue will remove urbanity attributes of Iranian urban spaces. The research studies two important factors in urban spaces, based on literature review: accessibility and vitality; using library and field study of Hamadan city to find the rate of their effect on urban spaces of Iran. Correlation analysis and questionnaire were used to codify analytic model. The main hypothesis of the research is the weakness of urban spaces in Iranian cities due to poor access and lack of vitality in these spaces, that is acquired by investigating aspects related to access and vitality. The results showed a positive correlation between urban spaces and these two factors, which control 44 percent of urban spaces efficiency as a common courtyard.
