The heat of the day does have a certain effect on patients with coronary heart disease. Clinically, there is a significant increase in the number of patients with coronary heart disease who suffer from angina pectoris or myocardial infarction during the hottest phase of the summer or the coldest phase of the winter, as well as during the alternation of winter and spring, autumn and winter, and the phase of large temperature difference between day and night, indicating that coronary heart disease is indeed related to climate change. Large temperature changes can easily lead to coronary vascular dysfunction, and excessive vasoconstriction or diastole can cause uncomfortable symptoms in patients with coronary artery disease. The severe winter season is prone to coronary vasospasm leading to increased symptoms of myocardial ischemia, and the hot summer period is characterized by more sweating in patients with coronary artery disease, and vasodilation can easily lead to hypotension, which can also easily lead to insufficient blood supply to the heart, brain and other important organs, so it is emphasized that patients with coronary artery disease, especially elderly patients with coronary artery disease, should not stay in particularly hot or cold environments for a long time.