Extended data:
Imperial Road, also known as Fei, was originally the architectural form of China Palace. It is a ramp between the pedestal and terrace and the steps on both sides of the central axis of the palace. In feudal times, only the emperor could use it, but most emperors rode jade instead of walking in and out of the palace, and the bearers walked on the steps, so he carved the imperial road into auspicious clouds and dragons to show that the emperor was the only thrill. Imperial Road was later adopted by China Temple (and Confucius Temple).
The number of carved dragons on the Imperial Road is located according to the legendary buildings. According to the theory of yin and yang, "the outer dynasty is yang and the inner dynasty is yin"; Odd numbers are positive and even numbers are negative. So the number of carved dragons on the imperial road has changed. For example, nine dragons are carved on the first floor of the three imperial roads, dragon five is carved on the second floor, and only dragon three is carved on the third floor; Six dragons were carved on the Imperial Road behind the Palace of Kunning.
In fact, the dragon is the theme in the palace where the emperor went to court, worked and lived. On the relatively short Imperial Road, most of them adopted the design of the dragon, and only Gan Qing Palace and the Imperial Road Center in front of the palace carved a group of dragons. There are also royal roads carved with dragon and phoenix patterns or double phoenix patterns in the six palaces of East and West.
References:
Baidu encyclopedia-the road to empire