Androgenetic Alopecia is a common hair disease in clinical dermatology without any other self-conscious symptoms. Many patients go to hospital due to their appearances concerns. Base on professor Wei Yuegang’s clinical experiences of treating androgenetic for many years， this article analyzes its etiology and pathogenesis， syndrome differentiation and treatment. The results indicated that disease differentiation and syndrome differentiation must be integrated into comprehensive analysis of both tip and root so as to provide reference for its clinical treatment.