According to legend, Cang Xie was an official under the Yellow Emperor. The Yellow Emperor assigned him to be in charge of the number of livestock in the fence and the number of food on the chariot. But slowly, the storage of livestock and food is also gradually increasing and changing, and my head alone can't remember it. Cang Xie was puzzled.

On this day, he took part in collective hunting and came to a fork in the road. Several old people were arguing about which way to take. An old man insisted on going east, saying there were antelopes; An old man wants to go north, saying that he can catch up with the deer not far ahead; An old man insisted on going west, saying that there were two tigers, and if they were not killed in time, they would miss the opportunity. Cang Xie, it turns out that they are all looking at the footprints of underground beasts. Cang Xie suddenly felt happy: Since a footprint represents a wild animal, why can't I use a symbol to represent what I am responsible for? He ran home happily and began to create various symbols to represent things. Sure enough, manage things well.

When the Yellow Emperor knew it, he praised it and ordered Cang Xie to teach this method to all tribes. Gradually, the usage of these symbols has been popularized. In this way, the text is formed.