Iran’s most important threat, is us threat, that its militarization based on maritime. The purpose of this research is answer to this question that which factors deterred us aggression over Iran’s security interests in Persian Gulf at last three decade? In this research, we used descriptive and analytic method and gathering library in formations questionnaire for quantitative data. The results were shown to 100 specialist people and then we analyzed these results by SPSS software. The results emphasis the impacts of geopolitical, man powers, equip mental and tactical capabilities of Iran naval forces deterring us naval forces aggression over Iran’s security interests. of Course, United States America had hit Iran’s interests at last three decades, but these deterring factors that we referred them, prevented USA from hitting further. Therefore, Islamic Republic of Iran for reserving own security and improvement its deterrence, must practice appropriate actions for creating and developing new factors.