Professor Feng studied under Tung Chee-hwa, Hu Xishu and other famous traditional Chinese medicine practitioners, and has been engaged in classic prescription research and clinical application for decades. This paper systematically summarizes the research results of Mr. Hu Xishu, a master of classical prescriptions, and verifies the formation of the theoretical system of classical prescriptions. He took the lead in proposing that Treatise on Febrile Diseases belongs to the unique theoretical system of classic prescriptions of traditional Chinese medicine, and published a paper on how to write Treatise on Febrile Diseases and Miscellaneous Diseases. Professor Feng devoted himself to academic research and clinic for many years, and solved many academic puzzles, pointing out that the classic prescription has a unique theoretical system, which is different from the syndrome differentiation system of zang-fu organs and meridians represented by Huangdi Neijing. Its clinical application in the treatment of internal medicine, gynecology, pediatrics, surgery and other diseases is simple and effective.