This essay analyzes the background and theory of hybrid courts by reviewing United Nation documents. In addition, the methodology of this essay follows the case study method. The cases under examination in this essay focus on the Special Panels for Serious Crimes in East Timor, Regulation 64 Panels in the Courts of Kosovo, Special Court for Sierra Leone, Extraordinary Chambers in the Courts of Cambodia, Special Tribunal for Lebanon, and Extraordinary African Chambers. The main findings of this essay are: (1) in post-conflict states, society will be more harmonious by achieving transnational justice, which is a benefit of employing the hybrid court; (2) the hybrid court is a key legal tool to rebuild the domestic judicial system of post-conflict states; (3) by integrating a different judicial system, the hybrid court will allow for new forms of prosecuting serious crimes in international criminal law.