With the increasing number of diabetic patients, treatment with insulin is the most common method, as a diabetic patient or his family, the correct mastery of insulin injection method has become an essential skill. First, before injecting insulin, you should have a detailed understanding of the concentration and specifications of the injection solution, to avoid the occurrence of not understanding the specifications of the injection of too much or too little, resulting in patients with hyperglycemia or hypoglycemia, second, disinfection before injection, the injector should wash his hands, and then adjust the injection pen to the prescribed scale. Third, choose the correct injection area, disinfect the injection area with a sterilized cotton ball, then lift the skin with the thumb, forefinger and middle finger, choose the injection angle according to the different lengths of the needle for injection, the needle should stay under the skin for about 10 seconds during the injection, and don’t rub the injection site.