Jiaozi originated from the ancient slot. Jiaozi, formerly known as Jiaoer, is said to have been first invented by Zhang Zhongjing, a Chinese doctor, with a history of more than 1,800 years. It is a folk staple food and local snacks in northern China, and it is also a festival food. There is a folk song called "A slight cold, eat jiaozi for the New Year." Jiaozi is often boiled with flour and leather bag stuffing.

According to legend, when Zhang Zhongjing, a native of Henan, was the prefect of Changsha, he often cured diseases for the people. One year, when the local plague prevailed, he built a cauldron at the entrance of Yamen, giving up medicine to save people, which won the love of Changsha people. After Zhang Zhongjing retired from Changsha, he just happened to catch up with the winter solstice and walked to the bank of the Baihe River in his hometown. He saw many poor people suffering from hunger and cold, and their ears were frozen.

It turned out that typhoid fever was prevalent at that time, and many people died. He was very upset and determined to treat them. When Zhang Zhongjing came home, there were many people seeking medical treatment. He was as busy as a bee, but he always remembered the poor people with frozen ears. Following the example of Changsha, he told his disciples to set up a medical shed and cauldron in an open space in Dongguan, Nanyang, and open it on the day of the winter solstice to give medicine to the poor to cure their injuries. It has been applied until the New Year's Eve.