According to the law, when handling a case, a lawyer may apply to the court or procuratorate for consulting and copying the case files. When consulting the file, it is necessary to submit the lawyer's practice certificate and the certificate (letter) and power of attorney issued by the law firm.
Legal basis: Article 40 of the Criminal Procedure Law of People's Republic of China (PRC). From the date when the people's procuratorate examines and files the case, the defense lawyer may consult, extract and copy the case file. Other defenders may also consult, extract and copy the above materials with the permission of the people's court or the people's procuratorate.