The time proportion for hypoglycemia represents the time proportion for hypoglycemia time (<3.9) to the total valid time. Clinical studies show that hypoglycemia is more severe than hyperglycemia because it may cause acute irreversible braintissue injury. Generally, when hypoglycemia has been detected once during the 72 hours monitoring period, it may represent abnormal glucose metabolism and requires attention, though not immediate disposal of the sensor. However, for patients whose hypoglycemia happened repeatedly without insulin injections, immediate attention is required. For patients with insulin injections, hypoglycemia is usually caused by incorrect insulin dosage or incorrect injection time, so that insulin treatment needs to be adjusted according to the analysis of the dynamic illustration.