The systematic examination of impotence includes history inquiry, physical examination, laboratory examination and special examination. 1. Medical history examination: this program is mainly to do the preliminary understanding, such as the manifestation of erectile dysfunction, the severity of the disease and the duration of the disease, as well as in the sexual life with or without a normal erection, sexual life position changes affect the erection and so on. 2. Physical examination: this part mainly observes the development of male secondary sexual characteristics and whether there is any deformity or abnormality in his reproductive system. 3. Laboratory tests: These tests usually include blood glucose, blood lipids, blood pressure, urine sugar, sex hormone, thyroid hormone, and so on. 4. Special examination: this test is to further search for the cause of erectile dysfunction, such as nocturnal penile distension test, penile blood flow test, visual and auditory stimulation response measurement, etc., can better identify the cause of the disease.