Myocardial infarction is caused by the presence of coronary artery atherosclerosis, and myocardial infarction is caused by the aggravation of myocardial ischemia in the process of running. Myocardial infarction is a complete blockage of the coronary arteries, there is the basis of coronary atherosclerosis, myocardial infarction occurs as a result of the sudden rupture of the plaque lesions. Exercise process heart beat faster, blood flow rate increases, for the coronary artery impact acceleration, the narrow part of the plaque will cause a greater impact, so that the pressure within the plaque rises significantly, when the pressure reaches a certain level, the plaque will suddenly rupture, inducing platelet rapid aggregation, leading to complete blockage of blood vessels, blood flow interruption, myocardial infarction. Patients with coronary heart disease should pay attention to control the intensity of exercise, not strenuous exercise, otherwise it may lead to the occurrence of acute myocardial infarction. Patients with coronary heart disease should be under the guidance of a physician for formal treatment, scientific and reasonable exercise to prevent the occurrence of myocardial infarction.