Dr. Lijun Cao serves as a training instructor of "basic life support and advanced cardiovascular life support" of the American Heart Association, director of China Association of Emergency Female Doctors, member of Cardiac Critical Care Professional Committee of Cross Strait Medical and Health Exchange Association, and standing member of Disaster Medicine and Emergency Rescue Physician Branch of Shandong Medical Doctor Association. She is a member of Emergency and Critical Care Professional Committee of Shandong Medical Doctor Association, member of Shandong Provincial Cardiac Critical Care Working Committee, member of the Committee of Extracorporeal Life Support, and member of Professional Committee of Shandong Association of Integrated Traditional Chinese and Western Medicine. Dr. Cao Presided over and participated in a number of provincial and ministerial scientific research projects. She presided over and participated in a number of provincial and ministerial scientific research projects. She serves as the secretary of standardized resident training. She has been engaged in emergency medicine for more than 16 years and is good at rescuing, treating and monitoring critically ill patients.