Solid drinks are a kind of soft drinks, which are mainly divided into protein solid drinks (including amino acid drinks) and ordinary solid drinks. Protein solid drinks refer to products containing milk and dairy products, eggs and egg products, other animal and plant proteins, amino acids, etc. As the main raw material, with or without auxiliary materials, and the protein content is greater than or equal to 4%. Common products include soybean milk powder, walnut powder, malt extract, amino acids and so on. Ordinary solid beverage refers to the product with fruit powder or roasted coffee, tea, chrysanthemum, white grass and other plant extracts as the main raw materials, with or without other auxiliary materials, and the protein content is less than 4%. Common ones are sour plum powder, chrysanthemum crystal, instant tea powder, cogongrass rhizome extract, amino acid beverage and so on. Solid drinks have always been favored by consumers because of their wide variety, unique flavor and easy preservation. Especially those solid drinks rich in vitamins, minerals, amino acids and other nutrients can supplement the nutrients needed by human metabolism in time and become good companions for many people. Solid drinks are made by removing water from liquid drinks. The purpose of removing water is: first, to prevent dry drinks from deteriorating or rotting due to their own enzymes or microorganisms, and to facilitate storage; Second, it is convenient for storage and transportation. Compared with liquid drinks, solid drinks have the following characteristics: the weight is obviously reduced, the volume is obviously reduced, and it is easy to carry; Good flavor, good instant solubility, wide application range and convenient drinking; Easy to maintain hygiene; Simple packaging and convenient transportation.