Langwei has focused on criminal defense, he is familiar with provisions of criminal cases in both merits and procedures. He can offer non-Chinese nationals in custody who violate Chinese criminal law with entire criminal defense legal services, including the phases of investigation, examination & prosecution, and trials.

Services include:
●Investigation phase: Meeting a criminal suspect in custody, getting to know the charges of the crime involved and any relevant circumstance of the case, providing the criminal suspect with legal advice, applying for a bail, filing petitions or accusations on behalf of the criminal suspect
●Examination and prosecution phase: Defending a criminal suspect in accordance with law, consulting, extracting, and duplicating relevant case files and technical identification and evaluation materials, meeting the criminal suspect in custody, investigating and gathering relevant evidence materials, presenting legal opinions to the people’s procuratorate on suspect’s release who is not necessary to be indicted
●Trial phase: Defending a criminal defendant during procedures at first and second instances, consulting, extracting, and duplicating case-related materials, meeting a criminal defendant, investigating and gathering evidences, participating in a court session to hear the case, presenting defense opinions regarding innocence of a crime, pettiness of a crime, or mitigation of or exemption from criminal liability.