With the development of China’s society and the intensification of social aging, cardiovascular and cerebrovascular diseases are diseases that seriously endanger the health and lives of our people, with high mortality and disability rates. In the past 30 years, the mortality rate, incidence rate and prevalence of cardiovascular diseases in our population are generally on the rise, and the age of onset is early. Cardiovascular disease has become the most important public health problem in China, and about 2 out of 5 deaths are caused by cardiovascular disease. In order to reduce the morbidity, mortality and recurrence rate of cardiovascular disease and actively and effectively improve the prognosis of patients, it is important to improve the lifestyle. Among them, exercise is indispensable, that exercise the best time and precautions are what? A, cardiovascular and cerebrovascular disease patients have a risk of morning exercise Statistics show that about 70% to 80% of patients with cardiovascular and cerebrovascular disease are in the early morning onset, so cardiovascular and cerebrovascular experts call early morning hours cardiovascular and cerebrovascular disease “devil’s time”. For example, in the case of hypertension, studies have shown that people with elevated blood pressure in the early morning have a 3 times higher rate of sudden onset of disease than others. Early morning blood pressure control is important to effectively prevent sudden onset of cardiovascular disease, and the rate of sudden onset of disease is three times higher in the group with elevated morning blood pressure than in the group with elevated non-morning blood pressure. It has also been confirmed that the peak incidence of cardiovascular disease is generally at the time of day when sympathetic nerve activity is strongest. The incidence of myocardial infarction is three times higher at 9 a.m. than at 9 p.m. The peak incidence of sudden cardiac death is also between 9 a.m. and 12 a.m.; the incidence of stroke is approximately 60% higher in the early morning. Older adults die in the early morning hours in 60% of cases, and sudden cardiovascular events amount to 70%-80%. The possible reasons for their occurrence may be related to the rapid rise of catecholamines, renin and angiotensin in plasma after waking up in the early morning, which leads to rapid rise in blood pressure, accelerated heart rate, vasoconstriction and easy rupture of atherosclerotic plaques, which in turn causes sudden cardiovascular and cerebrovascular diseases. This shows that for people with high risk of cardiovascular and cerebrovascular disease and patients, avoid morning exercise. Second, the best exercise time and precautions for patients with cardiovascular and cerebrovascular disease For patients with cardiovascular and cerebrovascular disease, exercise is best arranged in the afternoon, for health, it is best to adjust the time to the afternoon of the day when the temperature is higher. Especially in the cold season, it is more important to put the exercise time in the afternoon. For cardiovascular and cerebrovascular patients who have developed the habit of morning exercise, the time of morning exercise should be postponed as much as possible, and then start morning exercise when the sun rises and the temperature rises slightly. Winter exercise precautions: 1. warm up before exercise, exercise to keep warm, avoid cold wind exercise. 2. exercise should be appropriate for the person, the ability to do, gradual, and appropriate. 3. avoid a full meal before exercise, because after a full meal can increase the burden on the heart. 4. exercise can carry emergency drugs. Once the symptoms appear, patients must go to the doctor in time. Therefore, for the elderly with cardiovascular disease, early morning exercise in winter is quite dangerous.