Ancient people found that when cooking dumplings, they would float up and down in the water, roll with the boiling water and float on the water until they were cooked. According to this feature, they named them "Floating Yuanzi" and later renamed them as dumplings.

The shape of glutinous rice balls is a round ball, symbolizing reunion. People in China eat glutinous rice balls at the Lantern Festival in the hope that the whole family will be reunited in the new year. In the Song Dynasty, people in Ningbo, Zhejiang Province made this kind of food with white and tender appearance and sweet and delicious filling for the first time by using glutinous rice flour produced locally, plus lard, black sesame seeds and sugar.

Introduction of the fifteenth day of the first month:

The fifteenth day of the first lunar month is the Lantern Festival. Also known as Shangyuan Festival, Lantern Festival and Lantern Festival. According to legend, Emperor Wendi of Han Dynasty (former179-former 157) celebrated zhou bo's quelling of the Zhulu Rebellion on on the 15th day of the first month. Every night, he would go out to play and have fun with the people.

In ancient times, the night was the same as the night, and the first month was also called January. The Chinese Emperor designated the fifteenth day of the first month as the Lantern Festival, and this night was called Yuanxiao. Sima Qian founded taichu calendar, which listed the Lantern Festival as a major festival. Since the Sui, Tang and Song Dynasties, it has been in full swing.