Cardiopulmonary function tests can be divided into cardiac function assessment and pulmonary function assessment. 1. Cardiac function assessment: including symptom classification (such as NYHA cardiac function classification), echocardiography, cardiac load test (such as cardiac electrical exercise test, drug load test, exercise load nuclear myocardial imaging test, 6-minute walk test) and so on. 2. Lung function evaluation: lung volume test (tidal volume, inspiratory volume, expiratory volume, deep inspiratory volume, functional residual air volume, lung capacity, total lung volume), lung ventilation function test (ventilation per minute, maximum voluntary ventilation, exertion lung capacity, maximum expiratory flow, alveolar ventilation). The heart is an important power organ of the human body, and cardiac function assessment is of great value in the diagnosis of cardiac diseases, understanding the functional reserve and adaptive capacity of the heart, formulating rehabilitation prescriptions and judging the prognosis. Pulmonary function tests can assist in the early detection of lung and airway disease, assessing the severity and prognosis of the disease, and evaluating the efficacy of medications or other treatments. Cardiopulmonary function tests are not suitable for everyone, and should be done in a timely manner. Doctors will analyze the situation and make a clear diagnosis according to the specific circumstances.