Till today Shahnama-e-Firdousi has gained much attention of schools and common men. In this noble and ever lasting literary work along with special elements of epic literature which is the dominating aspect, one meets elements like: Vow, oath, love etc. contains general aspects which are mostly connected with human emotions and according the genre it is considered as lyrical Poetry. Vow and …. Have a special and basic position in Shahnama and one can find the origin of many incidents while observing allegiance and fickleness of the beloved.From ancient times taking an oath or signing a treaty is one of the fundamental, religious, moral, and social elements among Iranians and other nations. This is also practiced in many cultured societies. In ancient times a kind of system based on the believes of Mithraism (god of pactor treaty) ruled the Indo-European society. These believes with the passage of time evoluted and found way in the mythological, epical and lyrical texts of nations, “Written Oaths” in Persian literature itself is the sign of importance of these elements in Iranian Culture and society.In this article an analytical approach has been made to study of oath and treaty in the ancient Iranian text and its impact especially on the social aspects in Shahnama-e-Firdousi. As oath taking is one of the inseperable topics of Shahnama-e- Firdousi and a very close tie can be seen between these two, therefore the oaths and treaties present in Shahnama will be analysed.