In the eyes of the ancients, the dragon's main achievement was showering. This function of the dragon comes from the ancient agricultural economy and farming culture in China. During Du Fu's residence in Kuizhou (now Fengjie), there was a drought there. People thought the dragon was asleep in the forest, so they lit torches and set the forest on fire. "The wind blew a huge flame, and Hehan puffed up a column of smoke. Want to burn Kunlun, bright and beautiful. "(Du Fu's Fire) With such a large amount of manpower and material resources, it can be seen that the rain function of the dragon is deeply rooted in people's hearts.
However, the more common way is to pray for the dragon. When Su Shi was a satrap in Xuzhou, he encountered a drought. He led the local people to ask the dragon for rain. As luck would have it, it really rained. Su Shi is very happy. He went to inspect the growth of crops and wrote down the bustling scene of the countryside after the rain with the words "Huanxisha": "Jujube flowers are falling in the rustling skirts, cars are ringing in the south of the village, and cows and clothes are selling cucumbers. The road is long and Xiu Yuan is awkward. The Japanese are thirsty for tea and knock on the door to ask the wild people. "
During the Tang and Song Dynasties, there were many Fu poems with dragons as the description objects. Most of the content is to show the dragon's vigorous posture and the contribution of rain, and the weather is very wide, such as Bai Juyi's "Black Dragon Drinking Wei Shui Fu". Wang Anshi's "Dragon Fu" is unique and has high literary value.
As for the story of the Dragon King, it can be found in novels and plays. Li's "Biography" wrote that everything will be fine after saving the dragon girl, and the story is tortuous and fascinating. In Romance of the Gods, Ina made trouble in the sea, and in The Journey to the West, the Dragon King was invited to rain to exorcise demons.