Egg yolk， used as food and medicine， is often restricted to nourishing yin only in modern clinic application of Chinese medicine. This article systematically analyses the effect and clinical application of egg yolk and egg yolk oil in previous literature. We point out egg yolk has an integrated effect of nourishing yin and supplying blood， Strengthening spleen and promoting tissue regeneration and relieving diarrhea with astringents， aiming to expand the clinic application of egg yolk and contributing to the clinical curative effect.