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"Health Treasure Mirror" was written by Luo Tianyi, with a total of twenty-four volumes and one supplement. The year of writing is unknown and it was published in 1281. The Yuan version of this book was lost due to war. The earliest surviving version can be found in the series "Jisheng Distinguishers" compiled by Du Sijing in the Yuan Dynasty, but the content is incomplete. There are 25 chapters in the book, mainly including "Everlasting Lessons from Medical Mistakes": a case study form, combined with a special topic for analysis, to warn future students and colleagues not to make mistakes in mistreatment; "Collection of Famous Prescriptions": a selection of 766 ancient and modern prescriptions, which are based on syndromes and prescriptions, and have theoretical methods to discuss the diagnosis and treatment of various clinical diseases. This is the main part of the book, "Medicine Methods": a brief description of Zhang Yuanyou and Li Gao's pharmacological theories, such as nature, taste, efficacy, etc.; "Medical Experimental Records": recording the author's long-term clinical diagnosis and treatment experience, rich in content; and finally "Supplement", which selects the prescriptions of Zhang Zhongjing and other schools on external diseases, heat stroke and other diseases, and is supplemented by others after the Yuan Dynasty. The book is theoretically based on "Su Wen" and "Difficult Classics" to find out the causes, and fully absorbs Li Gao's "Spleen and Stomach Theory" and the understandings of doctors such as Zhang Yuanyu, Zhang Bi, Qian Yi, etc., And systematically elaborates on the theory of syndrome differentiation and treatment of clinical viscera and miscellaneous diseases, which has the distinctive characteristics of the "Yishui School". When using drugs for clinical syndromes, the relevant drug theories of Jiegu and Dongyuan are introduced in a large space, and the flexible syndrome differentiation and drug use ideas such as relative medicine to syndrome, consistency of name and reality, and addition and subtraction according to syndrome are emphasized.