Synomorphy in architecture seeks the maximum synomorphy between the body, function and behavioral paradigm in line with the needs and perceptions of the residents and focuses on creating a positive experience for them. The function of the environment and the residents’ behavior, in an interactional relationship, is a common core between humans and the environment. Accordingly, the evaluation of synomorphy in behavioral settings helps us understand the efficiency of the environment. This study evaluates the effect of religious occasions (Christmas) on the formation of synomorphy in Jolfa, Isfahan. This is an applied study of a descriptive-analytical type performed using a qualitative-quantitative approach. Data were collected using document review, ethnography and field observations, especially through random observations within a targeted period of time - at three points in time before, at the beginning, and at the end of Christmas in three time periods: (9 to 12 in the morning), (14 to 17 in the afternoon) and (19 to 22 at night) and then they were analyzed. The field observations in Jolfa neighborhood of Isfahan shows that there are differences in the behavioral and social paradigm between the periods under research (ritual occasion period and normal days) and this factor affects the efficiency of the current uses in the area under investigation. The results of this study show that ritual occasions can significantly strengthen and stabilize the synomorphy paradigm. These occasions also lead to the emergence of certain patterns of behavior, activities, and changes in the environment, which may affect the behavior and different elements of the environment. In this regard, the synomorphy of the studied area can be increased through solutions such as modifying the urban furniture layout and increasing the quality and behavioral capabilities of urban walls.