Discussing the position of expediency in the decision-making of the GUARDIAN COUNCIL is one of the important issues. The basic question in this context is what is the position of expediency in the decision-making of the GUARDIAN COUNCIL and what was the decision-making process of this COUNCIL regarding the position of expediency regarding the parliament's approvals in the field of extradition of criminals? The present article is descriptive and analytical and has investigated the mentioned question by using the library method. The results of the research show that in the decision-making process, the GUARDIAN COUNCIL has basically based the two principles of observing the principles of the Constitution and Sharia standards, which is the inherent duty of this COUNCIL. And even though awareness of the requirements of the time and issues of the day is one of the characteristics of the GUARDIAN COUNCIL's jurisprudence stated in the constitution, and this can be the necessity of this COUNCIL's attention to expediency in its decisions, however, the difference of the parliament, which is committed to approving the laws It is according to the interests of the country and the approach of this COUNCIL in not paying attention to expediency in its decisions led to the formation of the Expediency COUNCIL, which is responsible for resolving the differences between the Parliament and the GUARDIAN COUNCIL based on the expediency of the system.