Freeze-dried food is the abbreviation of vacuum freeze-dried food, also known as FD food. Because of the special process of freeze-drying, the color, flavor, nutrition, appearance and shape of the original fresh food can be kept to the greatest extent. In addition freeze-dried products without preservatives can be stored at room temperature for more than 5 years, and the finished product weight is light, easy to carry and transport, is the processing of tourism, leisure, convenient food excellent method. Freeze-dried food, known as the astronaut food of the past noble, now quietly into people's lives. In supermarkets, colorful freeze-dried green fruit slices, freeze-dried instant soup, freeze-dried dehydrated seafood, vegetables and so on can be seen everywhere. There are hundreds of varieties of agricultural products that can be processed by freeze-drying technology theoretically, but the varieties that are really accepted by the market due to various factors are relatively limited, and the market of the vast majority of varieties are all in foreign countries. At present, our country exports a large number of varieties are: double spore mushroom, green asparagus, red bell pepper, green bell pepper, sweet corn, strawberry, chives, carrots, beef, shrimp and so on.