There is no specific standard for determining the dawn phenomenon of blood glucose values, usually for diabetic patients with fasting blood glucose above 9~10mmol/L, it is necessary to consider the existence of the dawn phenomenon. The “dawn phenomenon” refers to the phenomenon of diabetic patients with normal blood glucose at night, and a rise in fasting blood glucose at dawn due to excessive secretion of glucagon, which is called the “dawn phenomenon”. To identify the dawn phenomenon, it is first necessary to clarify whether hypoglycemia occurs at night. If hypoglycemia occurs during the night and a reactive rise in blood glucose occurs at dawn, this is called the “Soumoujie” phenomenon. The dawn phenomenon is characterized by no hypoglycemia at night, but fasting blood glucose rises at dawn (3-9 am), so it can be judged by taking additional blood glucose measurements at 0-2 pm at night. It is recommended that diabetic patients monitor their blood glucose regularly, and if there is a persistent rise in blood glucose, they need to consult a doctor in time for timely treatment under the guidance of the doctor to maintain stable blood glucose.