Insulin is a peptide hormone, which is an effective way to control blood sugar for diabetic patients. The temperature for long-term storage of insulin is 2-8°C. Care should be taken to avoid icing or large temperature fluctuations, and it can be stored for a long time until the expiration date marked on the box under the condition of 2-8°C. Insulin in use can be stored at room temperature below 25℃ for 4 weeks, that is, insulin in use can be stored at room temperature below 25℃ without being placed in the refrigerator. If insulin in use is placed in the refrigerator, it should be placed at room temperature for at least half an hour after removal, and it can be injected subcutaneously only when the temperature reaches room temperature, otherwise the temperature of insulin is too low, which will easily aggravate the irritation symptoms of subcutaneous injection or cause pain, and also affect the absorption rate of insulin injected subcutaneously.