As one of the “five horsemen” of diabetes treatment, exercise has always been an important part of the comprehensive treatment of diabetes. In winter, when the flu and diseases are common, exercise is an essential measure to enhance cold tolerance and disease resistance. In winter, many diabetic patients start to worry again, because the cold temperature is colder, and the cold stimulation increases adrenaline secretion and slows down blood glucose metabolism, which makes blood glucose rise, and blood glucose is more difficult to control than in other seasons. Complications such as diabetic foot are also most likely to occur or recur in winter. In addition to medication and diet, exercise is an effective way to control blood glucose. Exercise for diabetic patients has its own special characteristics and can be harmful to the body if not taken care of. So what are the precautions for diabetic patients to take when exercising in this cold winter season? Exercise for diabetic patients has its own special characteristics and can be harmful to the body if not taken care of. Many diabetic patients, especially the elderly, like to get up early and go to the park for morning exercise, not knowing that incorrect exercise may bring great harm. Because the plants and trees have not yet started photosynthesis in the morning, not much oxygen is released and the concentration of carbon dioxide is higher than during the day. Moreover, the ground temperature drops at night, the pollutants in the air not only can not diffuse upward, but also tends to fall back, as breathing deepens and accelerates, dust and germs can easily enter the body through the respiratory tract. Diabetic patients with poor resistance to disease, if in the morning exercise fitness, very easy to aggravate the disease. In addition, the morning is usually the lowest blood sugar time of the day, in addition to fasting, at this time exercise is prone to hypoglycemic reaction, and even cause hypoglycemic coma, especially the injection of insulin or oral sulfonylurea hypoglycemic drugs for diabetics. In addition, after lying down overnight, the viscosity of the blood increases, the vasoconstriction of elderly diabetics is poor, the ability to adapt to falling temperatures is poor, easily caused by angina pectoris, myocardial infarction, cerebral hemorrhage, cerebral thrombosis and other critical situations. Therefore, the best time for diabetic exercise in winter is generally 9:00-11:00 a.m. and 2:00-4:00 p.m.; you can drink 150-200ml of warm water before exercise. At the same time in the cold winter sports exercise to do a good job to keep warm, to prevent the wind and cold attack. Diabetic exercise is a daily compulsory course, exercise to treat diabetes must be persistent, long-term persistence to achieve the desired results. Especially in the folk “winter tonic”, “New Year’s reunion” period, mountains and seafood, chicken, duck and fish, pushing cups, ushering, etc., easily lead to blood sugar fluctuations, complications, coupled with the winter cold, more likely to add insult to injury. Therefore, in winter, diabetics should pay more attention to appropriate exercise.