Abstract: The narrative of Rostam and Sheghad in Firdowsi Shahname is one of the rare masterpieces of poem writing in ancient poem of Persian. In addition to the fantastic idea and theme of the narrative techniques, this story is unique and prominent among other works of Firdowsi. In this article, the narrative function of this story is provided based on change square, break square, narrative process and actant analysis and according to theoretical framework of Greimas. Findings show that the main actant (Rostam) is not the absolute subordination of a plan, however, one can say that with the help of the motive force of feeling and emotion (sense of brotherhood) and in the other hand, it somewhat subordinated partially by the induction flow generated by Sheghad and the king of Kabul has been exited from his usual intellectual and prowess way ( campaign and wise battle) in spite of his value and credit, he suffers from lethargy and paralysis and caused to form a tragic narrative. From the narrative processes, this story follows Greimasian semiotic- semantic. Likewise, it should be noted that Greimas’s semantic square is credit for this story, although, due to the numerous narrative sections and frequent chains which cause to break and sometimes the incredibility of the semantic square and also regarding the involvement of the internal and non-actant factors ( internal feeling of Rostam and Sheghad) it is worthwhile that tension square with more flexibility and less certainty would be credited rather than semantic square in the narrative course of Rostam and Sheghad story as well.