1. The criteria for closing criminal cases are as follows:

(1) In the investigation stage, if the public security organ thinks that the case does not meet the conditions for filing, it can close the case by not filing it;

(2) If it is at the stage of the procuratorate, if the procuratorate thinks that it does not meet the conditions for prosecution, it will make a decision not to prosecute and close the case;

(3) If it comes to the trial stage, the court will make a judgment to close the case.

2. Legal basis: Article 175th of the Criminal Procedure Law of People's Republic of China (PRC).

Supplementary investigation of a case examined by a people's procuratorate may require the public security organ to provide evidence materials necessary for the trial; If he thinks that there may be cases of collecting evidence by illegal means as stipulated in Article 56 of this Law, he may be required to explain the legality of collecting evidence.

When examining a case, the people's procuratorate may return it to the public security organ for supplementary investigation or conduct its own investigation.

A case under supplementary investigation shall be completed within one month. Supplementary investigation is limited to two times. After the supplementary investigation is transferred to the people's procuratorate, the people's procuratorate recalculates the time limit for examination and prosecution.

If the people's procuratorate still believes that the evidence is insufficient and does not meet the conditions for prosecution in the case of the second supplementary investigation, it shall make a decision not to prosecute.

Second, what are the complete procedures of criminal proceedings?

The complete procedure of criminal proceedings is as follows:

1. In the investigation stage, the public security organs impose criminal detention on the flagrante delicto or major suspect. However, detainees should be questioned within 24 hours after detention. A criminal suspect may hire a lawyer to provide legal advice, complaints and accusations on his behalf after the first interrogation by the investigation organ or the day when compulsory measures are taken;

2. At the stage of examination and prosecution by the people's procuratorate, when the people's procuratorate examines the case, it shall interrogate the criminal suspect, listen to the victim's statement and prosecute the crime;

3. In the court trial stage, the people's court shall, after reviewing the cases that have been prosecuted, decide to hold a hearing on the cases in which the accused criminal facts have been stated in the indictment, accompanied by a list of evidence, a list of witnesses and copies or photos of the main evidence, except those involving state secrets or personal privacy.