Subcutaneous insulin injection is an effective method to control blood glucose in diabetic patients. The use of insulin must be under the guidance of a doctor and the appropriate treatment plan must be chosen. The steps of insulin injection include the following: 1. Wash hands before injection to avoid contamination of insulin injection utensils. 2. Mix insulin well, if premixed insulin, or premixed insulin analogues are used, it is necessary to mix insulin well beforehand. 3. Install the needle, vent, and adjust the required insulin dose accurately. 4. Choose the appropriate insulin injection site and sterilize it, preprandial insulin is preferred in the abdomen The basal insulin can be injected in the buttocks or subcutaneously in the upper arm, disinfect the injection site with 75% alcohol and wait for the alcohol to fully evaporate before injection, pay attention to the rotation of the injection site to avoid repeated injections in the same area. 5, insulin injection should be carried out with a quick needle entry, slowly push the drug, and leave the needle under the skin for 10 seconds after injection before pulling it out to prevent excessive drug leakage. 6, removal of insulin After injecting the needle, gently press the injection site with a cotton swab.