Generally speaking, blood glucose in diabetic patients is more likely to fluctuate in winter, leading to elevated blood glucose. This is because the stimulation of cold will make sympathetic nerves excited, which will increase the secretion of adrenaline in the body, increase the output of liver sugar, reduce the uptake of glucose by muscles and slow down the metabolism of blood sugar, thus easily causing blood sugar to rise. In addition, the cold weather and wind will reduce human activity and energy consumption, which will also raise blood sugar. In winter, the temperature drops and sweating decreases, which easily leads to the increase of secretion of various digestive juices and people’s appetite is also one of the factors of elevated blood sugar. Therefore, before the arrival of winter, we should enhance the awareness of self-care, do a good job of freezing and heat preservation, and prevent the occurrence of diabetes and its complications. 1. routine examination: before winter, we should do a comprehensive routine examination, such as biochemical and glycated hemoglobin examination, etc., which can help to grasp the condition, timely find physical abnormalities, and adjust the treatment plan at the right time. 2. exercise: avoid bad mood, actively participate in various recreational activities, and reasonably arrange exercise. 2. Exercise: avoid bad mood, actively participate in various recreational activities and arrange exercise reasonably. Appropriate exercise can improve the body’s ability to resist cold and disease, and can also stimulate insulin secretion, which is very beneficial to regulating blood sugar and stabilizing the condition. Patients can choose the appropriate form of exercise according to themselves; 3. Diet: adhere to a reasonable and balanced diet, do a good job of diet control, under the guidance of the doctor according to their own situation to develop a scientific diet plan, eat less and more meals, less high-calorie, high-fat food. Those who have hunger can increase side dishes, such as soy products, dairy products, eat more fresh vegetables to meet the needs of the body; 4, warmth: do a good job of limb warmth, add clothing in a timely manner, and should pay special attention to foot warmth and health care, can be soaked in warm water at about 40 ℃ before bedtime, which helps improve local blood circulation. When cutting nails, pay attention to avoid gangrene caused by nail groove injury; shoes and socks should be comfortable and loose, avoid too tight and too hard, and change socks frequently to keep feet clean and dry. In addition, it is also recommended that patients should monitor their blood sugar well in any season of the year to avoid large fluctuations in blood sugar and adverse consequences.