Sugar is introduced as follows:

Sugar is a polyhydroxy (two or more) aldehyde or ketone, which can become one of the organic compounds after hydrolysis. Chemically, because it is composed of carbon, hydrogen and oxygen, similar to the polymerization of carbon and water in the chemical formula, it is also called carbohydrate.

The history of sucrose production is introduced as follows:

Prehistoric humans have known to ingest 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 to produce sugar. 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. Maltose is a kind of sugar made from rice (starch) and malt by saccharification and boiling, which is viscous and commonly known as maltose. Since the establishment of the Western Zhou Dynasty, it has been widely circulated among the people.

Sucrose production in Tang and Song Dynasties is introduced as follows:

In the sugar-making stage of handicraft industry, sugarcane pith was obtained from sugarcane during the Warring States period, sugarcane planting became increasingly prosperous, and sugarcane sugar-making technology was gradually improved. After nearly a thousand years of development, a large-scale workshop-style sugar industry was formed in the Tang and Song Dynasties. In 647 AD, Emperor Taizong sent people to India to learn how to cook sugar.

There is such a record in the Book of the New Tang Dynasty written by Ouyang Xiu and Song Qi: "... in the twenty-first year of Zhenguan, I sent an envoy to the emperor to offer Poirot trees and poplars. Emperor Taizong sent an envoy to take the method of boiling sugar, that is, all sugar cane in Yangzhou, like tussah, is far more color and taste than the western regions. " It shows that in the frequent cultural and scientific exchanges between China and India, there is also an exchange of experience in sugar-making technology.