Liquid medicines are stored in vials or ampoules. There are many kinds of liquid medicines and the nature of medicines is different, the storage conditions are also different, generally affected by temperature, moisture, light and other factors, can be divided into room temperature, low temperature, freezing, refrigerated, protected from light and other storage methods: for example, biological products (DPT vaccine) we should be placed in the medical special refrigerator, and to strictly control the refrigerator temperature, the temperature of which is between 2 degrees and 8 degrees. The stability of liquid medicines is not only related to its own nature, but also interfered by many external factors to a large extent, such as temperature, humidity, light, oxygen in the air, storage time, packaging containers and so on. In order to ensure the quality of liquid medicines, so the correct storage of liquid medicines, which should be carried out under the guidance of professional people, is particularly important.