According to the Iranian Legal System, the duty of the GIO is to monitor “the proper conduct of the affairs” and “the proper implementation of Rules” in the administrative agencies of the country. In spite of this legal clarity, ambiguity in the sense of "proper conduct of the affairs" makes ambiguity in the definition of supervisory duties of the GIO. In order to resolve this ambiguity, in this article we seek to understand the organization's regulatory tasks within the framework of good governance model. Today, this model is widely introduced by many scholars and international institutions as an effective mechanism for combating corruption. This article seeks to answer the main question: How we can consider this organization as a supervisory body for the implementation of good governance indicators in Iran? According to the research findings, the two fundamental Monitorial duties (includes the good conduct of the affairs and the proper implementation of laws), which are entrusted to the GIO under Article 174 of the Constitution, are proper Legal guarantors to the implementation of the components of good governance. Therefore, this paper considers the capabilities of applying the tasks of GIO in framework of good governance. By clarifying this concept, an appropriate theoretical framework is provide to explaining the tasks and missions of the GIO, and so a guideline will be made available to the inspectors of this organization