The “piracy jure gentium” is limited to “an illegal act of violence against another ship or aircraft”. Contrarily, it has the set of different methods of regulating to an unlawful act of seizure in the same ship or aircraft. It is a result of considering the jurisdiction principle that international community members depend on following, provides that the “piracy”, as a “hostes humani generic”, is applied to the “universal jurisdiction principle”, and the “seizure” is applied to the “exclusive jurisdiction principle” of Flag State or State of registration of the aircraft, according to International Treaty Law or Customary International Law. However, the Criminal Law of ROC may make a conflict relevant to the application of piracy between transnational and domestic criminal jurisdictions, for it does not distinguish whether the injured is the same ship or aircraft or not. According to the provisions, the depredation of property applies to the “piracy crime”, and the seizure and control in navigation applies to the “public dangerous crime” (article 185-1). Our criminal legislation shall respect the existing international regulations on crimes of piracy and seizure of shin and aircraft. The essay, gives an introduction of the development of the “piracy jure gentium” at first (chapter 2 and 3). Furthermore, inspects the regulations and faults of our existing and aircraft. The essay, gives an introduction of the development of the “piracy jure gentium” at first (chapter 2 and 3). Furthermore, inspects the regulations and faults of our existing Criminal Law in International Law (chapter 4 and 5). Lastly, the essay offers some revised provisions of suggestion (chapter 6), trying to promote our criminal legislation relevant to the piracy conforms to the regulations of International Law.