After Taoism was introduced into Korea, it can be roughly divided into three schools: Taoism, Taoist practice and Taoist folk belief, which have had a far-reaching impact on Korean society. The cultivation of Taoism in Korea is a Taoist school characterized by the study of Taoist alchemy, also known as alchemy and alchemy. Cui Zhiyuan is the most influential figure in Korean Neidan studies. He went to the Tang school to "return to the villain" (the cultivation method of Taoist Neidan) and later became the originator of Korean Taoist Neidan. His most important work is Sixteen Forms of Kidney Qi. Jin Keji, Nangong Dou, Jin Sixiu, Tian, Yin Junping, Kevin·Z, Zheng Tuan, etc. , have deep attainments in Taoist inner alchemy. Cui Zhiyuan's Sixteen Prescriptions of Shenqi Pills, Qin Shihuang's Prescriptions, Quan Kezhong's Notes on Shenqi Pills, Li Zhihan's Questions and Answers, and Guo Zaiyou's Real Prescriptions of Shenqi Pills are important works of the Inner Dan School of Korean Taoism. According to the biography of Haidong, during the 800 years from Silla to Renzu in the Korean Dynasty (1623- 1649), there were descendants of Inner Dan in Korean Taoism. The Heritage of the Three Kingdoms records that Jin Yuxin has seven stars on his back, which is the essence of his seven leisure times. At the age of seventeen, he went to Zhongyue Grottoes alone, fasted, appealed to heaven, and prayed that God would give him the power to unify the Three Kingdoms. So a magical old man appeared and spread his secret method. Later, I believed in God's protection and finally realized the great goal of reunifying the Three Kingdoms. Sun Di Jin Yan was also an alchemist. He once went to the Tang Dynasty to study Yin and Yang family law. Because of his cleverness and agility, his teacher taught him how to avoid armor and build success. In addition to the Taoist Neidan School, the practice mode of Taoist autopsy school was popular on the Korean peninsula at that time. The so-called "autopsy" is to separate the human soul from the body by physical methods and let the soul live forever. There are roughly five physical ways of this autopsy, namely "gold, wood, water, fire and earth". Xu Anjun, a monk from Silla, entered the Tang Dynasty to learn the methods of autopsy. He was the first person to spread the autopsy method to the Korean peninsula. He wrote The Art of Step-by-Step Parade. It is said that Cui Zhiyuan also studied the method of autopsy when he was studying in the Tang Dynasty. After returning to China, he studied the method of autopsy with his uncle Xu Anjun, and finally learned the method of autopsy, and wrote the Step-by-Step Introduction to Jiaxu. There is also a folklore circulating on the Korean peninsula. Cui Zhiyuan retired to Jueshan in his later years and practiced Buddhism very diligently. Finally, one morning, he left his clothes, shoes and hats in the bushes, but Cui Zhiyuan himself disappeared and was never seen again. Did Cui Zhiyuan ever become immortal? Although folklore does not provide us with an answer, we can infer from it that Cui Zhiyuan really has a unique attainments in Taoism. He practiced both inside and outside, spreading many Taoist cultures in the Tang Dynasty to the Korean Peninsula, laying a solid foundation for the development of Taoist culture on the Korean Peninsula.