Subcutaneous injection of insulin is an effective way for diabetic patients to control their blood glucose. Commonly used insulin injection sites include abdomen, upper arm, buttocks, outer thighs, etc., among which the abdominal skin absorbs insulin the fastest. Therefore, rapid-acting insulin, short-acting insulin and pre-meal premixed insulin are recommended to be injected subcutaneously in the abdomen. The method of abdominal subcutaneous injection should pay attention to the following points: 1, site selection, avoid the abdomen around the navel, in the umbilicus 1 inch away from the periphery of the line of subcutaneous injection. 2, accurate adjustment of insulin dose, alcohol disinfection to be injected subcutaneously, according to the thickness of the subcutaneous fat can be vertically into the needle, or can be tilted into the needle. If the patient is obviously thin and the subcutaneous fat is thin, you can pinch up the skin of the local injection site to prevent the injection into the muscle layer and affect the absorption of insulin.3. Attention should be paid to the rotation of the injection site, every two injections more than 1cm apart, and avoid repeating the injections in the same site within a month.4. Replace the insulin injection needle before each injection.