Abstract：Thin endometrium （TE） is one of the important factors causing female infertility. This paper discusses Professor HUANG Liansha's clinical approach of treating TE with modified Yubao Decoction based on the principle of tonifying kidney and replenishing essence. Professor HUANG believes that the core pathogenesis of TE is deficiency of kidney essence and insufficiency of essence and blood. Deficiency of kidney essence leads to deficiency of the sea of blood，dystrophy of the womb，and thinning of the endometrium. At the same time，Professor HUANG emphasizes the treatment according to individual features. For those with liver stagnation，spleen deficiency，blood stasis，and other syndromes，he flexibly combines the medicines of soothing liver，invigorating spleen，activating blood and removing stasis，and pays attention to the comprehensive intervention of emotional counseling and life adjustment.