In the entire criminal proceedings, the public security bureau, the procuratorate, the court each play what role.

Criminal proceedings refer to the activities of the public security organs, the people's procuratorates, and the people's courts, with the participation of the parties and other participants in the proceedings, in accordance with the procedures and requirements stipulated in the law, to check and verify whether the defendant has committed a crime, whether he or she deserves to be punished, and by what kind of criminal punishment.

In criminal proceedings, the public security organs are one of the organs exercising investigative power, and most of the investigative activities in criminal cases are carried out by the public security organs, whose duties are to be responsible for the investigation and pre-trial examination of criminal cases, and to detain, arrest and hold in custody current offenders, suspects or defendants who should be detained or arrested, in addition to sentencing to control, deprivation of political rights, In addition, it is also responsible for the execution, supervision and inspection of offenders sentenced to control, deprivation of political rights, probation, parole and provisional release from prison.

The Procuratorate is responsible for investigating criminal cases that come before it directly, examining criminal cases investigated by the public security organs and deciding whether or not to arrest or prosecute them, supervising whether or not the investigative activities of the public security organs are lawful, instituting public prosecutions and supporting them, supervising the lawfulness of the people's court's adjudicative activities, and supervising the lawfulness of the execution of sentences and rulings in criminal cases. In addition, supervision is exercised over the legality of the execution of judgments and rulings in criminal cases.

The people's courts are the judiciary organs of the state, representing the state to independently exercise judicial power according to the law, and the trial of criminal cases is the people's courts in criminal proceedings is the most basic competence; in addition, in order to ensure the smooth implementation of the criminal trial power, the court also has the following competence: to decide on the arrest of the criminal defendant, detention and summoning, release on bail and residence under surveillance; when necessary, it can carry out surveys, inspection, detention, identification and inquiry, freezing; if necessary, it can carry out investigation, inspection, identification and inquiry. , appraisal and inquiry, freezing; if there is a civil lawsuit, when necessary, can be seized, seizure of the defendant's property; in accordance with the provisions of the law, the exercise of certain judgments and rulings of the right to execute.