Freeze-dried coffee is to freeze coffee concentrate and evaporate water at low temperature, which is closer to fresh coffee and healthier. Instant coffee is made by grinding coffee beans into powder, then pressing at high temperature and spray drying. In this process, caffeine and other beneficial ingredients will be lost to a certain extent, and instant coffee is not so healthy compared with freeze-dried coffee. Freeze-dried coffee is an instant coffee made by freezing liquid products and removing ice by sublimation. It is often flaky, with loose and porous internal structure and rapid dissolution. Instant coffee is a dry coffee extract obtained by evaporating water in the coffee extract. It can be quickly dissolved in hot water, occupying less space and volume during storage and transportation, and is more resistant to storage. Instant coffee is different from more complicated traditional coffee brewing methods, and has gained wide popularity. The main ingredients of instant coffee are sugar, fat coffee partner and coffee. The nutrition is not as good as that of traditional coffee brewed with fresh coffee beans, with high fat and sugar, and low quality of protein and caffeine. The essence of coffee may be lost in the process of making, and it is harmful to drink it often.