Insulin should be kept in an environment of 2~8℃ Celsius for a long time, avoiding heat and sunlight, and can be kept at room temperature for about 4 weeks after opening. Usually insulin bought from the hospital can be kept in the freezer of the refrigerator, but in some special times, such as long-distance travel, long power outages, etc., there is no refrigerator available, and this article introduces some tips for preserving insulin under special circumstances. 1, long-distance travel: long-distance travel, such as travel by air, we should pay attention to the aircraft luggage compartment temperature is very low, the lowest temperature can be as low as -18 degrees Celsius, will freeze insulin bad. Therefore, when you go out by air, you cannot check your insulin in, but carry it with you. Now there is an insulin cryogenic carrying bag on the market, which can be prepared well in advance before going out. 2. Long-term power outage: If you encounter floods, earthquakes, etc., the power supply cannot keep up, and you cannot buy a special insulin storage bag in case of emergency, you can put the insulin in a dark, cool and light-proof place, such as putting the insulin in a thermos, well, or water tank. Tips: Since countries have strict restrictions on carry-on luggage when traveling by air, patients using insulin therapy must go to the hospital to get a certificate before going out to ensure that they can take insulin preparations on board.