199 1 graduated from the medical department of Shanghai medical university, majoring in forensic medicine, and worked as a surgical resident and attending physician in Shanghai port hospital. Since 1999, he has been engaged in forensic clinical appraisal and research in the Institute of Forensic Science and Technology of the Ministry of Justice, and later obtained a master's degree in medicine. He has served as chief forensic doctor, deputy chief forensic doctor and chief forensic doctor. He is currently a member of the Shanghai Expert Committee on Personal Injury Judicial Appraisal, a member of the Expert Database of Medical Accident Technical Appraisal and Adverse Reaction Appraisal of Vaccination of Shanghai Medical Association, a member of the National Forensic Clinical Judicial Appraisal Ability Verification Expert Group, and a training teacher of the National Judicial Appraiser Continuing Education Base.