The heart rate should be lowered according to different causes, as follows: 1, tachyarrhythmia: such as sinus tachycardia, supraventricular tachycardia, after removing the causes, according to the specific circumstances of the use of drug therapy, such as β-blockers, calcium antagonists, and other anti-arrhythmic drugs. If combined with heart failure, oral digoxin or intravenous cediran and other cardiac drugs; 2, hypoglycemia caused by fast heart rate: improve the state of hypoglycemia through timely meals, which can help to reduce the heart rate; 3, hyperthyroidism: due to the body secretion of excessive thyroid hormone caused by sympathetic nerve excitation, can be applied to improve the function of the thyroid gland, and at the same time use of metoprolol and other drugs to slow down the heart rate; 4, anemia caused tachycardia: due to anaemia, the heart rate of the heart rate can be reduced by the use of drugs, such as beta blockers, calcium antagonists and other anti-arrhythmic drugs, Anemia causing tachycardia: due to the decrease of oxygen-carrying capacity of hemoglobin, the tissue organs are lacking in oxygen, and fast heartbeat occurs. Iron deficiency anemia can be corrected by taking iron supplements such as ferrous succinate, which can help reduce the heart rate.