Erectile dysfunction（ ED） is a common and frequently-occurring disease in the male

with multiple pathogenesis. Traditional Chinese medicine（ TCM） proposes that the "qi and blood"and "collateral vessels"in the diagnosis and treatment of ED are the important entry points

and the malnutrition of blood and the collateral obstruction can cause dysfunction of pectoral qi

sinew and erection

which is the key pathogenesis for syndrome differentiation and treatment of ED. Danggui Sini Decoction（ 当归四逆汤） has functions such as warmly dredging to nourish and promoting blood circulation for removing obstruction in collaterals

which is an appropriate treatment for ED patients with blood deficiency and blood stasis syndrome and yang deficiency and cold dampness syndrome. The modern pharmacological effects of Danggui Sini Decoction also help to correct many pathological changes leading to ED. Clinical application of Danggui Sini Decoction in the treatment of ED should be well assured in the use of prescriptions and take into account other pathogenesis at the same time

with the modification according to the disease.