In quiet state, the normal heart rate of five-year-old children ranges from about 80 to 100 beats per minute, and children’s crying and violent exercise can also lead to short-term fluctuations in heart rate, which is also normal. Five-year-old children and normal adults, compared to the degree of development of the autonomic nervous system is relatively immature, the heart of the sympathetic nerve is relatively dominant, and the vagus nerve center of the heart inhibition is weaker, so its normal heart rate is relatively fast, measured in a quiet state, the normal heart rate per minute is about 80 to 100 times. When children play activities, crying, nervousness, its heart rate will increase, which is physiological; when the occurrence of pneumonia, bronchitis and other diseases, often accompanied by fever, will lead to increased heart rate. If symptoms such as fever or abnormal heart rate occur, it is recommended to go to the hospital in a timely manner, complete the relevant examinations, and then follow the doctor’s instructions to be targeted treatment.