The realm of Sharia as the boundaries of the Islamic legal system and the domain of the secondary practical precepts is a topic which has been addressed by theologians, traditionalists and jurisprudcnts.Two minor and major approaches to determine the domain of Fiqh precepts have created part of the debates and negotiations of theologians concerning the minor and major religion. Although tradition in a general sense has been referred to as sayings, ,acts and assertions of the Infallible for the approval or rejection of Sharia in comparison with certain individual and social domains, the verbal traditjon has been mainly referred to and action and assertive tradition have practically been neglected. The present article tries to examine the reasonability and emergence of acts and prove that the acts of the Infallible are reasons and emerges on the basis of religious precept, and this reasoning is of a rational type, and sometimes reasonability of acts is more powerful than the emergence of the words.In the event the acts of the Infallible should have an emergence in the religious precept, then in view of the fact that he has different acts, including natural and ordinary acts, mundane act, canonical act,... in the life, the Sharia may be considered to extend to various domains of individual and social life, thus defining and determining the boundaries of the legal system of Islam.