Discourse is correlated signifiers in which social trends formed and interaction of »Self« and »Other« is constructed and reality means.  Semantic structures deals with identity. Political boundries cause the establishment of identities in political arena which means against the radiacal otherness. The question of this research is how the process of meaning of terrorism is analyzed by Iranian and American actor? The hypothesis is, in the view of Iranian and American to the concept of terrorism, discursive trends in construction of »Self« and »Other« and the way of looking at terrorism plays an important role. In fact the way of looking at terrorism by these two actors, is an obvious example of articulation of a phenomenon with discursive trends and legends and ideals of each in constructing »Other« of terrorism. The ideals of each of these two actors as the legendary symbol in identity and discourse of foregn policy, from one side can prepare national identity and representation and difference and on the other side direct the foreign policy or represent something like terrorism. The research method is discourse analysis.