Impotence refers to a man’s inability to have an erection or to maintain a normal erection, which will affect his sexual life. The diagnosis of impotence is mainly based on clinical history, blood tests, ultrasonography and erectile function tests. 1. Clinical history: Ask about the specific situation of coitus, and make a preliminary diagnosis of the disease by asking about the erection. 2. Blood test: To check the changes of sex hormone levels in the body, especially testosterone levels, to further confirm the diagnosis of the disease. 3. Ultrasonography: Ultrasonography examines the blood flow in the penis to determine the blood supply. 4. Erectile function test: nighttime monitoring of erectile status and erectile function test after sexual stimulation. If you suspect that you are suffering from impotence, please consult the hospital in time and carry out standardized diagnosis and treatment under the guidance of the clinician to avoid delaying your condition.