For subcutaneous injection of insulin, firstly remove the insulin from the refrigerator and restore the temperature, secondly shake the insulin slowly up and down so that it becomes homogenized. Use 75% alcohol to sterilize the injection site, if you are allergic to alcohol, you can give water for injection to sterilize the site, and iodine-based disinfectants are prohibited. After the disinfection is completed, wait for the alcohol to evaporate and the skin to dry, then gently pinch up the injection site, and then inject the insulin injection solution subcutaneously, and keep it for 10 seconds after the specified dose is injected, and then pull out the needle, and dry the injection site with a cotton ball, and avoid squeezing and rubbing. Then replace the needle with a sleeve to avoid scratching the body.