The Six-Minute Walk Test, as a submaximal exercise capacity test, can serve as a basis for patients to develop exercise prescriptions for endurance training. It features simple methods, ease of implementation, low cost, safety, and the ability to objectively reflect patients' daily actual activity levels. Clinically, it has become a clinical tool for evaluating exercise capacity in COPD patients, cardiac function, treatment effects, and prognosis in heart failure patients. It has now become a standardized simple method for evaluating cardiopulmonary function in numerous large clinical studies.