Features and advantages: the hospital ranks second in the country (number of beds), and the annual number of inpatients ranks 1, reaching more than 45,000. It has a large number of difficult and serious disease resources and genetic resources, and has incomparable advantages in domestic and foreign scientific research institutions and other children's hospitals. This discipline has strong research ability and has undertaken a large number of high-level research projects, such as key projects of the National Natural Science Foundation, projects of the Ministry of Science and Technology, international projects and international cooperation projects. The research on early childhood development and follow-up health ranks first in the field of pediatrics in China; We have established close substantive cooperation with high-level experts at home and abroad; Breakthroughs have been made in interdisciplinary research and transformation of scientific and technological achievements. Many high-tech clinical technologies such as living donor liver transplantation and children's immune function reconstruction are at the leading level in China, and HIFU technology is the first in the world in the treatment of children's solid tumors. Proactive international cooperation and exchange is also one of the important features of this discipline. We have signed long-term cooperation agreements with 16 foreign universities and scientific research institutions. For example, he has cooperated with Professor Chen of the Epithelial Cell Biology Research Center of the Chinese University of Hong Kong for 9 years to conduct stem cell differentiation research; Cooperate with researcher Cao Wuchun, director of the State Key Laboratory of Microbial Epidemiology, Chinese Academy of Military Sciences, in the field of pathogenic microorganisms; Cooperate with Associate Professor Bao Liming of Cincinnati Children's Medical Center (director of Children's Clinical Molecular Medical Center of Children's Hospital for 3 years) to make molecular diagnosis of children's hospital widely used in the diagnosis of difficult diseases; He has nearly 10 cooperation experience with Professor Perara, founder of international molecular epidemiology and director of Children's Environmental Health Center of Columbia University. In particular, he has a preliminary intention to cooperate with Professor Song Weihong, an internationally renowned psychiatrist and neurologist at the University of British Columbia, to study child development and Alzheimer's disease.