| The thesis analyses the current situation of Yin deficiency constitution of human body through the comprehensive collection and reorganization to the ancient related literatures. It adapted the comments on yin deficiency of representative doctors in different historical period and pointed out their focuses and weaknesses.Congenital hereditary factor is the decisive cause in the forming of Yin deficiency constitution. It is especially closest to the mother in the heredity factor. In addition, it is also concerns with the sexual overindulgence, chronic abnormal emotions changes, addicted to alcohol and the geography and climate environment. The Yin deficiency constitution usually be observed among children, women and elderly people. And the Yin deficiency constitution is the unity of stability and the variety during the onset.There are similarities and differences between Yin deficiency constitution and Yin deficiency syndrome. The right recognition of Yin deficiency constitution has a great significance in the clinical practice of etiology and pathogenesis changes. At the same time, it can guide our syndrome differentiation, treatment and regimen more efficiently. |