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The reason why Shanghan (Cold Damage) is not clearly understood is that Zhonghan (contracting cold pathogens) confuses it. The reason why Wenyi (Plague/Epidemic Disease) is not clearly understood is that Shanghan confuses it. If one can clearly distinguish between them, then regarding the treatment of Shanghan and Wenyi, more than half of the understanding has been attained. Since Zhang Zhongjing, the study of Shanghan has been passed down generation after generation, with each having its own specialists. There are no less than dozens of books written to expound theories. Yet, regarding Wenyi, it is often neglected and not discussed. Occasional mentions consist of only a few words. The examination is imprecise, and the discussion is not detailed. Consequently, for the syndrome of Wenyi, there is no clear direction, and it is often treated using methods for Shanghan. Either large doses of warm-dispersing herbs are used, or bitter-cold herbs are overdosed, making it difficult for the disease to heal. My father, Liu Yinlan, was proficient in medical principles throughout his life. He served as an official in both the north and south; although burdened with administrative duties, whenever he heard of people's suffering from illness, he spared no effort to save them. I listened to my father's teachings, not merely day and night. Moreover, being prone to illness since childhood, I had the opportunity during leisure time to extensively read the Qi-Huang (Traditional Chinese Medicine classics) books collected by my family, thus gaining many insights. I realized that the category of Wenyi cannot be compared to other syndromes; it cannot be delayed for years or managed with slow regulation. Its efficacy appears within one or two doses, and recovery occurs within three to five days. It is imperative to study it urgently so that we may jointly board the raft of salvation. In the past, Wu Keyou's *Wenyi Lun* (Treatise on Plague) demonstrated superior insight compared to other schools, carving out a unique path, and it has already become popular throughout China and abroad. Therefore, his formulas and discussions are not included in this collection. Instead, I briefly express my humble views based on personal experience to assist Wu Keyou, which I believe will not be rejected by those discussing epidemics. Epidemic diseases encompass a broad range, while Wenyi is but one part thereof. I have added Zayi (Miscellaneous Epidemics) and Hanyi (Cold Epidemics), writing formulas and discussions for each, thereby completing the symptomatology and treatment. After editing and refining, the work is divided into six volumes: Shugu (Discussing Antiquity), Lunzhi (Discussing Treatment), Zayi (Miscellaneous Epidemics), Bianyi (Resolving Doubts), Zhu Fang (Various Formulas), and Yunqi (Climate and Qi). This allows it to roughly form a school of thought of its own. However, the completion of this book owes much to Jin'er. The title *Songfeng Shuo Yi* indicates that I dare not claim it as my own, reflecting the intention to attribute merit to my elders. It clearly distinguishes between Shanghan and Wenyi, as distinct as eyebrows, and the theoretical approach and treatment methods are quite cautious. I dare not obscure the strengths of the ancients and claim them as my own, nor dare I be misled by the reputation of former sages. However, epidemic symptoms change in thousands of ways; treatment must not be rigidly adhered to, nor should it be done arbitrarily. It is my earnest hope that gentlemen of like mind will apply divine wisdom and flexible adaptation. This is the preface.