This book consists of five volumes. In addition to discussing deficiency fire and excess fire, it differentiates between cold, heat, deficiency, excess, exterior, interior, yin, and yang. It details the eight therapeutic methods in medical practice and the four-character theory for treating cold-damage disease. It distinguishes the cold and heat of apoplexy, wind-cold, summerheat, warmth, and dry fire, and discusses miscellaneous syndromes of internal injury and external contraction, as well as women's diseases. It summarizes the eight principles of pattern identification and treatment, the eight methods, and the formulation of prescriptions based on syndromes, with detailed analysis, mostly reflecting clinical insights. The book concludes with an appendix on Waike Shifa. Additionally, the "Hundred Mistakes Song" and sections on ginseng and other topics go beyond medical prescriptions to prevent illnesses before they arise and serve as a guide for health preservation. This book represents Cheng's thirty years of medical experience, simplifying and summarizing previous theories. Its content combines foundational knowledge with clinical practice, making it accessible and easy to understand.