Androgenetic alopecia is a non-scarring chronic alopecia disease,although not directly affecting the patient's life and health,often brings serious psychological burden to the patient's life due to its disfiguring nature.There are many pathogenesis of androgen alopecia,but based on the symptoms,signs and medical history,it is often find that there is a lack of balance of Yingwei,so the author try to explain the pathogenesis of androgen alopecia from the perspective of Yingwei,and attach a case study which in order to provide theoretical reference for the clinical treatment of androgenic alopecia.