Meet the requirements of the investigation organ for approval.

Legal analysis: According to Chinese laws, when meeting a criminal suspect in custody or under residential surveillance in a criminal case endangering national security or terrorist activities, the permission of the investigation organ should be obtained. legal basis: in the case of the crime of endangering national security and the crime of terrorist activities in the third paragraph of Article 39 of the Criminal Procedure Law of People's Republic of China (PRC), the defense lawyer shall obtain the permission of the investigation organ when meeting the criminal suspect in custody during the investigation. The investigation organ shall notify the detention center of the above situation in advance.

article 53 of the procedures for handling criminal cases by public security organs. if a defense lawyer requests to meet with a criminal suspect in custody, the detention center shall arrange for a lawyer to meet with the criminal suspect within 48 hours after checking the lawyer's practice certificate, law firm certificate, power of attorney or legal aid letter of the criminal suspect, and notify the case handling department at the same time. In the process of investigation, when the defense lawyer meets the criminal suspect who is detained or under residential surveillance in criminal cases endangering national security or terrorist activities, the detention center or the residential surveillance execution organ shall also check the license decision document of the investigation organ.