The third is novelty. From the early slave society to the long feudal era, the rulers' pursuit of taste is often higher than sensuality. In the content of material desire, food enjoyment occupies a major position, which is not only the responsibility of the chef, but also the breakthrough point for the courtiers to please the emperor. It is with this historical pace that the food in the Forbidden City is constantly innovating and surprising. Take the Qing Dynasty as an example. Before entering the customs, raw materials such as cattle, sheep, pigs, deer, roe deer, chickens and ducks were often used in the royal meals of Emperor Taizong's birthday. After entering the customs, the emperors and nobles of Wang Fu refused to eat food, prompting the chefs to ponder all day, not only to make the world delicious, but also to create many famous dishes, such as "imperial cuisine"