Rao is one of many surnames in China, and is a descendant of one of the five ancient emperors. In China, Pingyang, posthumous title (now Linfen, Shanxi Province) was called Yao, and historically, it was called 1045 BC, because Yao's family in six countries was destroyed by Qin State to escape the war disaster. From then on, Liu Xun ascended the throne with Liu Xun's real name "Liu Bingyi" after the war disaster stopped. Later, he wrote to the world to avoid the taboo of the emperor's name "Xun" and changed the surname of the people to "Sun". Then, the ancient physician of the same dynasty played the emperor and said that the word "medicine" should also be taboo. Later, a word "food" was added to the left of the word "Yao", which became "food".