The Conception of the Applicable Law in International Criminal Court Statute

Criminal courts or Tribunals have to recourse to some sources when they are judging. Sources for any court or Tribunal will be concluded in the legal text. International criminal court statute in article 21 under title *Applicable Law in International Criminal court* statute determined main sources of court and categorizes their rankings. As a result, court as a criminal international jurisdiction, when issue a verdict hat to use these sources is shrine in article 21 statute and respect ranking that there is between them. Basically, there is some different, from view point of nature, hierarchy, and the sources is included in statue, and they are not equal in credit. Core question that rise is this that what are sources of in the statute that shrine in statute? What sources are not shrine in statute? What is the concept and nature of these sources? And what kind of hierarchy there is between them? The aims of this paper, is explain on nature and sources that mentioned in article 21, imply to hierarchy. This is a most important issue in international criminal court statute.