摘要:AbstractThe main purpose of this study is investigated on relationship between behavioral & psychological aspect of design factors in Public Square and social interaction among users. The specific survey method used in this study is cross-sectional survey design, the questionnaire survey in which questionnaires are used for data collection. This study addressed construct validity, the sampling method was non-probability (convenience) and data collected from 208 users of Sabze Meydan Square in Qazvin (Iran). The questionnaire includes a total of three constructs, psychological aspect, social activity type, social environment perception of public square users. In this study, for assessing the reliability of the questionnaire applied the coefficient of Cronbach alpha. The structural equation modeling (SEM) used to test of hypothesis and the finding of the research has the potential to enrich the body of knowledge among academicians as well as practitioners. The result revealed that the there is a positive relationship among behavioral & psychological aspects of design factors and social interaction in public square via users’ perception.