I. Erectile dysfunction (ED) is the persistent inability of the penis to maintain an adequate erection for satisfactory sexual intercourse for more than 3 months. Although ED is not harmful to the body, but related to physical and mental health, and has an important impact on the patient and spouse and even family happiness. It is estimated that the current incidence of ED accounts for more than 10% of adult men in China, and the incidence is on the rise, should attract sufficient attention to society. Second, the common causes of ED: the causes of ED are mainly divided into psychological, organic and mixed. 1, psychological factors Each person’s environment, experience, psychological state and personality characteristics are different, the same mental and social factors of the response also differ. For most people may not cause ED psychological frustration, for some people may become the causative factors of ED. Several common psycho-psychological factors affecting erectile function are: the influence of the developmental process; the impact of incompatible relationships between people; emotional reasons; cognitive reasons, etc. 2. Systemic diseases (1) Anatomical abnormalities such as congenital abnormalities, testicular atrophy, etc. (2) Cardio-pulmonary vascular diseases such as coronary heart disease, pulmonary heart disease, hypertension, myocardial infarction, etc. (3) Endocrine diseases such as diabetes mellitus, pituitary lesions, adrenal diseases, hyperthyroidism, etc. (4) Genitourinary diseases such as genitourinary test inflammation, cystectomy, radical prostatectomy, etc. (5) Neurological diseases such as traumatic brain and spinal cord injury, myasthenia gravis, peripheral neuropathy, etc. (6) Psychiatric disorders such as schizophrenia, depression, etc. (7) Other such as leukemia, pernicious anemia, etc. 3, drug factors: such as hypnotic sedatives, anti-anxiety drugs, antihypertensive diuretics, hormones, etc. 4.Smoking and alcohol abuse, etc. 5, age: in general, the onset of ED increases with age. Third, the principle of treatment 1, etiological treatment; 2, psychological treatment; 3, Chinese and Western medicine combined with drug therapy; 4, sexual function rehabilitation treatment.