What does the local public security bureau do before the trial in different places?

Report. For criminal offences, criminal suspects are now subject to compulsory measures of bail pending trial. If you need to go to a court session in a different place, you need to report the suspect's itinerary to the local public security bureau before the court session.

the court of the defendant's domicile held a hearing. Principle requires me to appear in court. If I don't appear in court, I will be in a passive position in the lawsuit. If you really have no time, you can entrust a lawyer to appear in court. If it is a criminal case, it is now in the period of bail pending trial. Now, because I am going to a different court, I need to go to the local public security bureau to file a case.