1, Legend has it that when Pangu created the world, a snake-headed woman named Nu Wa saw a hole in the sky and used refined colorful stone to mend it. She uses yellow mud to be a person again, and she keeps doing it all year round. On the day of the winter solstice, the climate gets cold, and the ears of loess people are always frozen off. She put a small hole in each loess person's ear, passed it with a thread, tied it at one end, and stuffed it into the loess person's mouth for the loess person to bite, so as to ensure that the ear was not frozen. Later, it evolved into the custom of eating jiaozi on the winter solstice.

2. Every year on the Winter Solstice Festival, people wrap jiaozi in the shape of ears, which means that the loess people made of Nuwa bite the ears with strings (stuffing) so as not to freeze off.