1, power of attorney;
2. Official letter from the law firm;
3. Special letter of introduction for lawyers to meet with criminal suspects and defendants;
4. A copy of the client's ID card;
5. Household registration book or marriage certificate or proof of kinship;
6. Lawyer's practice certificate.
Legal basis: Article 39 of the Criminal Procedure Law of People's Republic of China (PRC), defense lawyers can meet and correspond with criminal suspects and defendants in custody. Other defenders, with the permission of the people's courts and people's procuratorates, may also meet and correspond with criminal suspects and defendants in custody.