ZHANG Mei is a professor of gastroenterology, and a supervisor of doctoral candidates. She is the director of the Gastroenterology Department of Xuanwu Hospital, Capital Medical University. Holding a professional title of chief physician, she has been engaged in the medical treatment, teaching and studies of gastroenterology and gastrointestinal endoscopy for over 30 years, particularly good at the diagnosis, treatment, rescue and endoscopic interventional treatment of severe, difficult and complicated digestive diseases. She has been working on clinical treatment and teaching, accumulated abundant experience in the diagnosis and treatment of digestive diseases and made outstanding accomplishments in senile digestive diseases.