Dealing with international crime, preventing it, and achieving international criminal justice require the provision of the necessary powers to prosecute and investigate their perpetrators. The PROSECUTOR of the Court is responsible for prosecuting and investigating four international crimes, including genocide, crimes against humanity, war crimes and the crime of aggression. In this study, which has been written by descriptive-analytical method and using library resources, the results obtained are that the PROSECUTOR of the court has a duty to consider the rights of victims and defendants, examining cases in accordance with the principle of admissibility of claims, to establish a reasonable basis. N. The PROSECUTOR has the power, after conducting preliminary inquiries into the admissibility, interests of justice or the establishment of a reasonable basis for any prosecution or investigation by the Preliminary Branch of the Court, which has judicial oversight of the prosecution,Decide. The request of the PROSECUTOR together with the necessary documents in order to start the prosecution or investigation of the defendants, despite the judicial independence of the PROSECUTOR's office, will be subject to the approval of the preliminary branch. Once the request is approved, the PROSECUTOR will have the power to conduct preliminary investigations such as gathering evidence, summoning or apprehending the accused, investigating victims, witnesses and informants.