During the Song and Yuan Dynasties, the universal wooden donkey prototype was usually a round wooden board with four supporting donkey legs or rollers installed under it, just like an ordinary bench. The difference is that, first of all, its surface is not flat, but presents a certain curvature, similar to the shape of the donkey's back; In addition, in the middle of the long board, a log peg about two inches thick and more than one foot long is installed to stand upright, symbolizing the donkey ball, so it is generally called "wooden donkey". However, these vivid descriptions are neither proved by historical objects nor supported by serious historical materials. Most of the pictures circulating on the Internet are created by modern people. It's hard to win trust. On the contrary, according to the existing historical data, there is clear evidence that the so-called wooden donkey is not a so-called punishment specifically aimed at women. On the contrary, it is only a criminal car used to nail the hands and feet of prisoners, and male prisoners can also enjoy this treatment.