The contents that can be done include: 1. the natural conditions of the criminal suspect; 2. Whether and how to participate in the suspected case; 3. If guilty, state the main facts and circumstances involving conviction and sentencing; 4. If you believe that you are innocent, state your plea of innocence; 5. Whether the legal procedures of the compulsory measures taken are complete and the procedures are legal; 6. Whether their personal rights and litigation rights have been violated after being taken compulsory measures; 7. Other information that needs to be known. According to Article 37 of the Criminal Procedure Law, the defense lawyer can meet and communicate with the criminal suspect in custody to learn about the case; Provide legal assistance to suspects, and represent them in complaints and charges. Article 40 of the Provisions on the Procedure of the Public Security Organ in Handling Criminal Cases stipulates that the public security organ shall ensure that the defense lawyer is engaged in the following professional activities in accordance with the law during the investigation phase: 1. Ask the public security organ about the suspected crime and the case, and put forward opinions; 2. Meet and communicate with the criminal suspect to learn about the case; 3. Providing legal assistance to criminal suspects, representing them in appeals and complaints; 4. Apply for the change of compulsory measures for the criminal suspect. Then let's extend this question to: the place to meet the criminal suspect: 1. The place to meet the criminal suspect who is under surveillance and the criminal suspect who is under surveillance can be his residence or the residential surveillance place designated by the investigation organ. Other persons shall not be present at the meeting, but if the criminal suspect is a minor or a blind, deaf or mute person, his legal representative or close relatives shall be present at the meeting. And when the lawyer meets, he will not be monitored. 2. An interview with a criminal suspect who has not been detained at the end of the period may be held at his residence, unit or law firm. Other persons shall not be present at the meeting, but if the criminal suspect is a minor or blind, deaf or mute, his legal representative or close relatives shall be present at the meeting. And when the lawyer meets, he will not be monitored. 3. The meeting between a criminal suspect in custody and a criminal suspect in custody shall be held at the place of custody.