Heart rate for a long time 100 beats / min, improve the examination, according to the condition of the treatment given to reduce the heart rate, supplementation of thyroxine, correction of anemia, potassium supplementation. If the heart rate is around 100 beats/minute for a long period of time, the common physiological causes include smoking, drinking alcohol and coffee, mental excitement and emotional tension. Pathological causes include sinus tachycardia, hyperthyroidism and anemia. Dynamic electrocardiogram, thyroid function five items, blood routine, electrolyte examination, etc. can be improved to clarify the diagnosis. Physiological causes should try to adjust lifestyle habits, quit smoking and drinking alcohol, do not drink strong tea and coffee, try to maintain a calm mind, do not be too excited and nervous. Sinus tachycardia take slow heart rate medication, metoprolol succinate, bisoprolol; hyperthyroidism take methimazole; anemia needs to be treated for the cause of anemia, severe anemia transfusion treatment; hypokalemia usually eat more green leafy greens, oral potassium chloride tablets, all medications should be taken in accordance with the doctor’s instructions. Long-term heart rate of about 100 beats per minute, need to go to the hospital in time, clear cause, according to the doctor’s instructions for treatment.