“Yang transforms into Qi and Yin into shape” is a highly generalization of traditional Chinese medicine(TCM) on the process of one's birth,growth,prime of life,senectitude,and death.In recent years,the theory has been widely used in clinical practice,guiding clinical methods and prescriptions,and the curative effect is remarkable.The etiology,pathogenesis,and treatment methods related to the theory of “Yang transforms into Qi and Yin into shape” can be summarized into the following six aspects:1) Insufficiency of Yang transforming into Qi.Its pathogenesis lies in the deficiency of the heart,kidney,and spleen Yang,and the treatment should focus on warming Yang and transforming Qi.2) Insufficiency of Yin transforming into shape.Its pathogenesis lies in Yin consumption,thus failing to suppress Yang.For those with insufficient essence,it is necessary to supplement it with flavor.3) Excessive Yin transforming into shape.Its pathogenesis is that the pathological product stagnates for a long time and turns heat into poison.The treatment should adopt Yanghe Decoction to dredge striae and warm Qi and blood.4) Insufficient Yang transforming Qi and excessive Yin transforming into shape.Its pathogenesis lies in Yang deficiency and Yin cold condensation.Yang deficiency fails to be warmed,and Yin and body fluid turn into filth and turbidity.The treatment should emphasize Yang strengthening to remove Yin cold.5) Insufficient Yang transforming Qi and insufficient Yin transforming into shape.Its pathogenesis lies in the decline of Yang Qi and the deficiency of Yin essence,making the physiological function for Yin transforming into shape low,and the treatment should warm Qi and nourish flavor.6) Excessive Yang transforming Qi and insufficient Yin transforming into shape.Its pathogenesis is that Yang Qi is excessive,and dry heat is not moist,resulting in insufficient Yin.The treatment should nourish Yin blood.