"Yunji Qizhu" is a Taoist book. Editor-in-chief Zhang Junfang, a Jingde Jinshi under Emperor Zhenzong of the Song Dynasty. In the fifth year of Dazhong Xiangfu (1012), Zhang was appointed Zuo Lang and was ordered to preside over the correction of the Taoist books of the Secret Pavilion and the old Taoist collections of Suzhou, Yuezhou and Taizhou. In the third year of Tianxi's reign (1019), 4565 volumes of "Tiangong Treasures of the Song Dynasty" were compiled (now lost); more than 10,000 of its essences were collected and compiled into 122 volumes. Taoism calls the book box Yunji, and the Taoist books are divided into three parts (Dongzhen, Dongxuan, and Dongshen) and four assistants (Taixuan, Taiping, Taiqing, and Zhengyi), collectively called seven parts. Therefore, the book's "Automatic Preface" contains the words "the heroes of the seven parts of the Yunji" to complete the book, hence the name "The Seven Signs of the Yunji". Its contents include the principles of scriptures and teachings, the true status of immortals, taking Qi refining, inner elixirs, external elixirs, prescriptions and symbols, Shou Geng Shen, corpse interpretation techniques and praising poems, biographies of immortals, etc. Most of them are excerpts from the original texts and collected in categories without any discussion. The "Summary of the General Catalog of Sikuquanshu" states that this book "has clear categories and examples, a brief summary of references, and outlines and rules, all of which are appropriate. The essence of Taoism is also roughly summarized." It not only includes the main content of Taoist canon before the Northern Song Dynasty, but also preserves some chapters of lost Taoist books, which is an important material for the study of Taoism. It is included in "Zhengtong Tao Zang" and "Tao Zang Ji Yao"; however, the volume and text of the two are slightly different. The book provides an outline and in-depth explanation of Taoist doctrines, origins, and teachings of scriptures. It is a general Taoist work. The book also contains a large number of Taoist books from the Han, Wei, and Six Dynasties to the early Northern Song Dynasty, and describes the teaching system of the Shangqing Jing. It is particularly detailed on the cultivation methods of the Shangqing School, which can help readers grasp the development context and basic historical facts of early Taoism.