This exciting new work translates two 12th-century texts associated with the legendary immortals Zhongli Quan and Lü Dongbin, founders of the Zhong Lü tradition of internal alchemy. First, the Zhong-Lü chuandao ji, in dialogue format, outlines the cosmological parameters of the practice, then describes various methods of attainment. Second, the Lingbao bifa, assembling various revealed sources and commentaries, presents similar concepts and adds more specific practices. In addition to the translations, The Zhong-Lü System provides a discussion in five chapters: Historical Unfolding, The Workings of the Universe, The Human Condition, Stages and Processes, and Key Practices. It makes both the underlying cosmology and the practical transformation accessible and understandable in plain, straightforward language. Beyond providing an in-depth understanding for modern practitioners, the work is essential for anyone concerned with Daoist history, cosmology, and internal alchemy.