Heavy exercise may have an effect on blood glucose. Measurements taken at different times may vary, with an increase in blood glucose immediately after exercise and a decrease in blood glucose at intervals, even causing hypoglycemia. After heavy exercise, the hormone levels in the body will change in the early stage, especially adrenaline and glucocorticoid hormone levels will rise, which will easily cause a transient increase in blood glucose level. Measured at intervals, due to the exercise process in all aspects of the body will be mobilized, for the consumption of blood glucose will be faster, large exercise is easy to cause a short period of time the value of blood glucose decreased, there is not enough blood glucose reserves, easy to cause hypoglycemic conditions. Especially for diabetic patients, we should avoid too much exercise at one time to prevent blood sugar instability. Once the blood glucose value is found to be obviously abnormal, it is necessary to consult a doctor in time for examination and standardized treatment under the guidance of a clinician after diagnosis of the condition, so as to avoid delays in the condition.