1, beginning of winter is at the turn of autumn and winter, which is "mating time", so eating jiaozi at this time is "obeying God's will". Besides, China used to be an agricultural society. People who worked for one year took advantage of beginning of winter to have a rest and rewarded their families for their hard work in the past year.

The winter solstice played a very important role in ancient times. There is also a saying that "the winter solstice is as big as a year", and it was even a festival for a time. Eating jiaozi on this day is a common custom in northern China.