According to the provisions of the Criminal Procedure Law, the principle of trying criminal cases is: 1, and the principle that the investigation power, procuratorial power and judicial power are exercised by the state special organs according to law; 2. People's courts and people's procuratorates independently exercise their functions and powers according to law; 3. The principle of division of responsibilities, mutual cooperation and mutual restraint; 4, the people's Procuratorate shall implement the principle of legal supervision of criminal proceedings; 5. The principle of open trial.
Legal objectivity:
Article 19 of the Criminal Procedure Law criminal cases shall be investigated by public security organs, except as otherwise provided by law. Crimes such as illegal detention, extorting confessions by torture, and illegal search. The people's procuratorate may file a case for investigation of illegal acts found by judicial personnel in the process of legal supervision of litigation activities. If a major criminal case of a functionary of a state organ under the jurisdiction of a public security organ needs to be directly accepted by a people's procuratorate, it may be placed on file for investigation upon the decision of a people's procuratorate at or above the provincial level. Cases of private prosecution are directly accepted by the people's courts.