Professor Tang Nong is proficient in traditional Chinese medicine（TCM） Yang-supporting， and advocates TCM classics. He reveals the Yin-yang ontological structure of human body， and further described it by using the Hexagram Tai and Hexagram Pi of the book of Changes， gives strong proofs from theoretical derivation and empirical facts. He pointed out that the nature of the three yin diseases in treatise on exogenous febrile diseases are cold of insufficiency type， resulting in the destruction of human body yin-yang ontological structure which yang inner and yin outer， and merged hexagram Pi that yin and yang leave their original position. The key principle of treatment is to warm the coldness of three yin meridians， making the yin and yang harmony， restore the human body yin-yang ontological structure of yang inner and yin outer. He believes that vascular dementia belong to three yin diseases. Because of the deficiency cold of the three yin meridians， the storing function kidney is unfavorable， impacts on the storage of information， manifestations in vascular dementia memory loss. The retraction function of the Lung is the prerequisite for the storing function kidney. Therefore， professor Tang Nong made a point view to treat vascular dementia from the perspective of Lung. He also cites a relevant medical case to illustrate.