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In Islamic culture, dome continues its ancient representation when it becomes a clear epitome of Islamic substantial creation of the universe. Islamic signs such as center, circle and sphere which are inherently dome are immediately realized via a symbolic transfer. Although domes have unavoidable relationship with other elements signifying Iranian mosques form and function, it includes secrets and mysteries and says and unsays. They have independently provided various discussions for researchers. In some cases and especially in recent years, these studies have increased. Iranian mosques have possessed diverse categories such as their state of emergence and distinction from domes built in other countries, different shape, structural systems and process of their execution during successive centuries, structural strength and stability, as well as theoretical principles related to beauty and magnificence. In this article, beside a concise indication of the above mentioned cases, the structural examination of Iranian Jameh mosques dome is done.