Coronary heart disease is due to coronary atherosclerosis in coronary artery stenosis, myocardial ischemia and hypoxia, angina, myocardial infarction, arrhythmia, heart function is not complete and even sudden death. Chitosan oligosaccharide with the function of regulating blood pressure, regulating blood lipids and cholesterol etc., also can reduce blood viscosity, improve circulation, enhance myocardial function, so as to effectively prevent coronary heart disease.