In prehistoric times, people have known to eat sweet food from fresh fruits, honey and plants. Later, it was developed to make maltose from grains, and then to make sugar from sugarcane beets. The history of sugar production has roughly experienced three stages: early sugar production, manual sugar production and mechanized sugar production. China is one of the earliest countries in the world in the early sugar production stage. In the early stage, maltose and sucrose were dominant, and maltose played a greater role. Making wine and sugar from grain is a great progress for mankind. There is a poem in the Book of Songs of the Western Zhou Dynasty in China called "A good place, viola is in full bloom", which means that the land in Zhou is very fertile, and even viola and chicory are as sweet as chicory. It means that caramel existed as early as the Western Zhou Dynasty. Maltose is considered to be the earliest sugar made in the world. Maltose belongs to starch sugar, so it can be said that starch sugar has the longest history.