One reason why Iran is treated as a potential threat to Western and Middle Eastern security can be traced back to Khomeini's promotion of ”theexport of the revolution” since 1979. The policy was the embodiment of Islamic fundamentalism and was enforced by radical means. It made agreat impact, both on Iran itself in particular, and the Persian Gulf region in general. This article indicated that Iran's quest for establishing an Islamic community transcended and conflicted with the national interest based on a nation-state. Besides, the exporting of transnational activities and theological value not only transformed the Persian Gulf region from a homogeneous system to a heterogeneous one, but also from a dynamic balance-of-power system to a rigid polar one.