Tests related to male erectile dysfunction, including non-invasive and invasive tests, the most commonly used methods include the following: 1, laboratory tests, including blood routine, blood sugar, lipids, sex hormones, etc.; 2, penile nocturnal erection test, or NPT; 3, audiovisual stimulation penile hardness test; 4, penile cavernosal injection vascular drug test, or ICI; 5, penile color Doppler ultrasonography; 6 The penile cavernosal angiography, etc. In addition, the scoring scale about erectile dysfunction is also very important.