1, insulin injection sites: abdomen subcutaneous fat layer; outer thigh subcutaneous fat layer; hip subcutaneous fat layer; outer upper arm subcutaneous fat layer. It is generally recommended to use the subcutaneous fat layer of the abdomen and the subcutaneous fat layer of the thighs, mainly because these two parts can be operated with both hands, which is convenient and safe to use. 2. Precautions: (1) Time: For short-acting insulin, inject once subcutaneously half an hour before each meal; for medium-acting insulin, inject once subcutaneously one hour before each meal; for long-acting insulin, inject once subcutaneously once a day, one hour before breakfast. (2) The dose must be clearly read before injection: 4 units/0.1 ml of insulin; (3) Strictly implement aseptic operation: local skin disinfection after injection. (4) If you need to mix short-acting and long-acting injections: short-acting should be drawn first, followed by long-acting, and the long-acting solution should be shaken well; (5) The puncture points should be more than 2 centimeters apart, and the injection site should be changed daily, and attention should be paid to avoid vascular damage when injecting, and do not massage the injection site; (6) Regular and quantitative (7) Regular and quantitative physical activities; (8) Close observation of hypoglycemic reactions caused by insulin overdose; (9) Frequent monitoring of blood glucose and urine sugar, adjusting insulin dosage according to blood glucose and seeking medical consultation when appropriate.