Professor Sun’s research has centred on cardiovascular disease, with particular emphasis on cardiac electrophysiology, mechanisms of arrhythmia, and the clinical application of cardiac pacing and defibrillation technologies. Through clinical and translational research programmes, he has contributed to the diagnosis and treatment of cardiovascular diseases and to the development of interventional cardiology and cardiac electrophysiology in China. His work has been published in peer-reviewed cardiovascular journals and has included research on arrhythmia mechanisms, electrophysiological diagnosis, and pacing and defibrillation therapies. Through sustained clinical research, postgraduate supervision, and participation in national cardiovascular research programmes and international academic collaboration, Professor Sun has contributed to connecting advances in cardiac electrophysiology and interventional cardiology with clinical practice, medical education, and the prevention and management of cardiovascular disease.