Noodles evolved on the basis of "courtesy noodles" in the Zhou Dynasty. Known as "soup cake" in Qin and Han dynasties, it belongs to one of "boiled cakes"; During the Sui and Tang Dynasties, it was called "longevity noodles", which meant cooking in a pot for a long time. During the Song and Yuan Dynasties, it was renamed "water sliding surface". According to Han Yi's "Yi Ya Legacy" in Yuan Dynasty, "Water slippery surface: knead it with extremely white flour, and find a preparation. A catty is more than ten yuan.