Nowadays, insulin injection is getting easier and easier, and insulin is usually injected with insulin pen. 1. Preservation Unopened insulin should be avoided from sunlight and freezing, and stored at a constant temperature of 4℃-8℃. Please note: Insulin should never be put in the freezer so as not to freeze the insulin and thus the drug activity will be destroyed and affect the efficacy. Before injection, insulin should be allowed to return to room temperature. Insulin that has already been used can be stored at room temperature. 2.Injection site According to the absorption rate from fast to slow, the injection sites are abdomen (5 cm around the navel), upper and outer arm, front and outer thighs, and buttocks. The injection sites should be rotated regularly within the injection area, because always injecting at the same point will cause the subcutaneous tissue fat to atrophy and be poorly absorbed. The dosage of insulin injection is not set in stone but adjusted according to the blood sugar level. 4.Disinfection Alcohol disinfection The needle should be changed one at a time in principle. 5.Avoid hypoglycemia Insulin injection must pay attention to eating on time after injection, do not engage in sports activities or work before eating after injection to avoid the occurrence of hypoglycemia, and contact the doctor in time if there is any problem.