As well the private life requires spaces with high privacy, also for social life requires suitable public space. Social interactions are an important part of human life and take place in public places and affect the quality of life of people in many ways. Due to the importance of social interactions and their impact on the quality of people's lives, it is necessary that researchers study this issue and its dimensions in the physical structure of today's cities. Bushehr is one of the cities that, despite the different cultures and the existence of people with different religions, has successfully created sustainable social interactions. In this historical texture, physical delicacy has made a favorable behavioral setting for the people in the past. The purpose of this study is to investigate the role of the physical spatial structure of Bushehr's historical texture on the social interactions of citizens to identify and analyze effective strategies in creating and strengthening social interactions and using them in today's urban planning and architecture. Now the question is, what is the relationship between the urban structure in Bushehr's historical texture and social interactions? Accordingly, the authors conducted this research using inductive and qualitative strategies. The research structure is organized in two parts: the theoretical part using library resources and the field section using historical images, valid internet sources, and direct observation of the historical texture of Bushehr. The results showed that the physical structure of Bushehr had been done in the classification of squares (small and big ones) and passages. With their characteristics, each of these has helped create the right conditions for establishing a desirable behavioral base and social interactions. The results showed that the physical structure of Bushehr's historical texture had been classified in squares, small roundabouts, and alleys, and each has helped to create the suitable conditions for making a favorable behavioral setting and social interactions through their characteristics.