Bowing down is a kind of etiquette in ancient China to show high respect for each other, and it is also the longest-lasting and most frequently used etiquette in ancient China. At the beginning of the bowing ceremony, it didn't, or didn't have a very serious color of rank or personal insult. In ancient times, there were no such daily necessities as tables, chairs and high beds in either the palace hall or the official residence. Men, women and children, regardless of poverty or rank, sit on the floor. The method is "knees on the ground, feet on the ground". In other words, people sit with their knees on the ground and their hips on the soles of their feet. This sitting posture is not a salute to the other side, nor is it a one-way act of condescending to others, but a meaningless relative sitting. When people adopt this sitting posture, if they need to pay tribute to someone, as long as they stand up straight and leave their hips under their feet, they will become kneeling posture; When people touch the ground with their hands, it becomes a worship posture; Touching the ground with your head is a kind of collapse. The ancients thought that you should not kneel or worship. Worship means salute in ancient times. According to the etiquette of the Zhou Dynasty, there were strict regulations on the actions and objects of bowing at that time, and * * * was divided into kowtowing, nodding and empty worship, which was called "formal bowing". At the same time, a woman's bow ceremony, Su Bai, was also derived. During the Spring and Autumn Period and the Warring States Period, as a kind of etiquette, bowing formed a strict system. After the Han dynasty, there was a high seat gradually, and the "kneeling" changed a lot, but the worship ceremony still existed and gradually became a symbol of rank difference, mainly used in officialdom. Later, the etiquette of playing thousands, bowing and bowing was added. The "three kneels and nine knocks" with complicated procedures and requiring a lot of physical strength began in the Qing Dynasty, which strengthened the bow-down etiquette from form to content, showing the majesty and majesty of the emperor and the humbleness and humbleness of his subjects.