So far, castles Chaharmahal and Bakhtiari Province from the perspective of geometric studies in the history of the study is not serious. Based on the ideas in the geometry of the Iranian monuments throughout history has been a fixed identity and continuity. The architecture is based on the geometry that Featuring fit the form and structure of the plan and levels. By identifying and analyzing physical geometry castle Chaharmahal and Bakhtiari Province in terms of form and geometry of the Fermi architecture and how architecture can be realized components. Geometric architecture Castles directly from the size, dimensions, plan, shape or form it takes effect. Iranian researchers in the castle on spiritual hypotheses or plan the manufacturing process, independent of the physical geometry of the architecture they have paid. This article first tries to place the physical geometry Sardar Asad castle in Chaharmahal and Bakhtiari Province in the process of formation of architecture and examine it. This study analyzes the use of a form of plan members castle fortress physical geometry of the architectural features of the present samples will be analyzed. The method used in this study is based on data and field data library includes local harvest. This article is intended to effect structural changes to analyze the aspects of castle architecture. A review of the reports on the review and rethinking of the province shows the castle. To date, these analyzes are mainly geometric approach to the formation of Khan Neshin castle in the identification has taken place.