Monar Jonban is one of the historical and valuable monuments in Isfahan, Iran. When one of its minarets begins to vibrate, the other one starts shaking simultaneously. Therefore, the vibration can be felt in the whole structure. This is the significant point of this historical monument. The purpose of this study is to evaluate the vibration mechanism of Monar Jonban and the reason of its shaking. Field work is used to conduct the research. After gathering data, a three-dimensional model for frequency and dynamic analysis has been made in Abaqus finite element software. In this paper the test results of International Institute of Earthquake Engineering and Seismology (IIEES) in 1994 are used to illustrate the validity of modeling as well as analysis. Besides, a modal analysis of the model of structure and cantilevered minaret has been done. Then, the generated equivalent dynamic force and also the deformation of minarets have been shown by dynamic analysis. There is a gap beside minaret; finally it has been shown that the gap improves dynamic behavior of the structure.