Zhang Ruixing, chief physician, Professor, doctor of medicine, supervisor of master's degree of Hebei Medical University, director of digestive department of the fourth hospital of Hebei Medical University. From August 2009 to January 2010, as a visiting scholar, he studied in the Department of gastroenterology at the University of Texas Medical Branch in the United States.

It mainly studies gastrointestinal motility disease, drug-induced liver damage, digestive system tumor. The main diagnosis and treatment of chronic gastritis, reflux esophagitis, chronic liver disease, chronic enteritis, acute pancreatitis, gastrointestinal bleeding, digestive system tumors, functional gastrointestinal diseases. Especially abdominal pain, abdominal distention, jaundice, diarrhea, constipation, ascites and other symptoms.

He has undertaken the research projects of natural fund of Hebei Province, science and technology department and Health Department of Hebei Province, won the third prize of science and technology progress of science and Technology Department of Hebei Province, and the first prize of scientific and technological achievements of Health Department of Hebei Province and administration of traditional Chinese medicine of Hebei Province. He has published more than 30 papers in domestic and foreign journals, edited and participated in three works.