Zhang Boduan (984-1082) was a Taoist priest of the Northern Song Dynasty. The founding master of the Southern School of the Neidan School of Taoism. His courtesy name was Pingshu. Later, he changed his name to Yongcheng and styled himself "Ziyang Shanren", so he was also called Zhang Ziyang in later generations. A native of Tiantai (now in Zhejiang Province). From a young age, I have been fond of learning, and I have studied the teachings of Confucianism, Taoism and Buddhism, as well as law, numerology, medicine, 卜筮, warfare, astronomy, geography, good fortune, death and life. Having served as a provincial official for decades, he suddenly realized the saying, "A family's warmth brings a thousand families' resentment; half a lifetime of fame and fortune brings a hundred lifetimes of guilt." Seeing through fame and fortune, he set his heart on the path to immortality and thus set fire to all the documents on the case. He was exiled to Lingnan for the crime of "burning documents". During the reign of Emperor Yingzong of Song (1064-1067), Lu 诜 was stationed in Guilin, summoned to his tent, and was in charge of the secret affairs. In the second year of Xining (1069), follow Lu 诜 to Chengdu, encounter a true man who teaches the golden elixir medicine the key of heat, "Point the stream to know the source, one word to understand a hundred". He passed away in the fifth year of the Yuanfeng era (1082), leaving behind the "Poem on the Interpretation of the Corpse" which reads: "The four elements are about to disperse, the floating clouds are already empty, one spirit is wondrous, and the Dharma realm is in perfect harmony." The book "Wu Zhen Pian" he authored promotes the theory of Taoist inner alchemy cultivation, which states, "First, it uses the lifeblood of immortals to guide their cultivation; second, it uses the wonderful functions of Buddhas to broaden their supernatural powers; and finally, it uses the true nature of enlightenment to dispel their illusions and return to the ultimate and empty origin." Introducing the Confucian concept of "exploring the truth and realizing the essence" and the Buddhist concept of "sudden enlightenment and comprehensive understanding" into the inner alchemy cultivation of Taoism, it holds that "although the teachings are divided into three parts, the Dao is unified", advocating the integration of the three teachings to clarify the profound essence of the great elixir. He criticized that "in later generations, the yellow and black circles each specialized in their own ways and were not right with each other, which led to the confusion and differences among the three schools of thought and prevented them from converging into one." This was quite insightful. He advocated the "dual cultivation of life and nature", emphasizing the cultivation of one's nature first and then one's nature, which was different from the "nature first and then life" advocated by the Northern Emperor Wang Chongyang. This book has been annotated by many people in later generations and is an important work on alchemy following Wei Boyang's "Zhouyi Can Tongqi". His thoughts had a significant influence on Taoism in later generations. He was regarded as the first of the Five Patriarchs of the Southern School and was called "Ziyang Zhenren". The Daozang also includes three volumes of "Jade Clear, Gold Chest, Qinghua Secret Text, Golden Treasure Inner Alchemy Formula" and one volume of "Four Hundred Characters of Golden Elixir", both of which were written by Zhang Boduan.