The legend of Jigong is a kind of folk oral literature developed from the story of Dao Ji, a high monk of the Southern Song Dynasty. It is distributed in Zhejiang Province with Tiantai as the center, and radiates throughout the country and affects the world. During the Six Dynasties, Sui and Tang Dynasties, many legends of Arhats and crazy monks were circulated in Tiantai. In the early Southern Song Dynasty, Dao Ji was born in Tiantai, pretending to be crazy to save the world, and was called "Jidian". Before and after Dao Ji's life, many supernatural legends about him appeared in Tiantai, which were talked about by people. Since the Ming and Qing Dynasties, the legend of Jigong has been widely circulated throughout the country and has become a household folk story. The content of the Jigong legend in Tiantai involves the legend of Jigong's birth as the reincarnation of the Dragon-Subduing Arhat, the legend of the young Jigong of the child prodigy Li Xiuyuan, the legend of Jigong's crazy salvation, punishment of evil and promotion of good, helping the poor and the needy, and the legend of playing tricks to subdue demons. There are also many folk customs and legends related to Jigong. The legend of Jigong is attached to real historical figures, has the originality of the region, and at the same time highlights the mysterious supernatural power and the magical nature of the plot. In addition, the legend covers all aspects of life, with rich and diverse content, reflecting the joys, sorrows, anger and happiness of the people, and has a distinct people-oriented nature. The actions of the protagonist are also mixed with Zen thought and Arhat belief. For more than 800 years, the legend of Jigong has become an inexhaustible source of material for literature and art, and has been vividly reflected in novels, calligraphy and painting, sculptures, film and television, etc. At the same time, as a unique cultural phenomenon, the legend of Jigong is deeply engraved in the hearts of the people, and will surely play a positive role in promoting contemporary moral education and the inheritance of the Chinese national spirit. Because the historical environment of survival has changed, the original Jigong legend is currently in an endangered state, and it is urgent to take practical measures to protect it.