Usually, there is no such thing as a one-minute self-test for impotence, so it is unreliable. Impotence, also known as erectile dysfunction, testing needs to go to a regular hospital. It can be checked by penile color Doppler ultrasonography, penile cavernous perfusion manometry and imaging, and penile nocturnal erection test. 1. Penile color Doppler ultrasonography: can diagnose vascular impotence. It can detect the diameter of cavernous artery in the penis, peak systolic flow rate, end-diastolic flow rate, resistance index and other indicators. 2. Penile cavernous perfusion manometry and imaging: can be used to diagnose venous erectile dysfunction. Patients who present with venous occlusive function can be visualized with contrast images. In case of traumatic venous fistulae, the image of venous fistulae can be shown at the place of injury. 3. Nocturnal penile erection test: can be used to identify psychological as well as organic erectile dysfunction. Usually 2-3 consecutive nights, men in deep sleep period, the number of penile erection, the hardness of the head of the penis, duration and so on. In addition, if you go to the hospital to diagnose erectile dysfunction, patients are advised to follow the doctor’s instructions for treatment.