When explaining Huangdi Neijing, Ni mainly referred to books such as "Huangdi Neijing", "Lingshu", "Acupuncture Classic", "Acupuncture Masterpiece", "Shennong Herbal Classic", "Treatise on Febrile Diseases" and "Synopsis of Golden Chamber". These books are classic works of traditional Chinese medicine and play an important role in understanding Huangdi Neijing.