Filing a case refers to the judicial activities that the public security, judicial organs and other administrative law enforcement organs decide to investigate or try it as a criminal case after reviewing the materials such as reporting, accusation, report, surrender and private prosecution according to their respective jurisdictions, and when they think that criminal facts have occurred and need to be investigated for criminal responsibility. Under normal circumstances, the time limit for filing a criminal case for the Economic Investigation Brigade of the public security organ to accept reports, complaints, reports and surrenders is decided within seven days. Major and complicated clues can be extended to 30 days with the approval of the person in charge of the county-level public security organ. Especially important and complicated clues, with the approval of the person in charge of the public security organ at the prefecture (city) level, the time limit for filing a case for review can be extended to 60 days. Once a case is filed for investigation, in principle, it will be arrested at the first time. There is no specific time limit as to when you can arrest them.