The lack of erection in men is generally referred to as erectile dysfunction, which can be examined by physical examination, laboratory examination and imaging examination. 1. Physical examination: It can observe the patient’s skin, body shape, bone and muscle development, the presence of laryngeal knots, the distribution and sparseness of beard and body hair, and the presence of male breast development, etc. At the same time, it can observe the size of the penis, check whether there are deformities and hard nodules, and whether the testicles are normal. At the same time, observe the size of the penis, check whether there are deformities and hard knots, and whether the testicles are normal. 2. Laboratory examination: including blood routine, urine routine, liver function, kidney function, blood sugar and other basic tests to exclude systemic diseases. 3. Imaging examination: including penile color Doppler ultrasonography, penile cavernography, intra-vaginal arteriography and so on. Penile color Doppler ultrasonography is used to diagnose vascular erectile dysfunction; penile cavernography is used to diagnose venous erectile dysfunction; penile arteriography can clarify the location and extent of arterial lesions, and at the same time, it is feasible to dilate or interventional therapy. Erectile dysfunction according to the specific conditions of different can also be used other methods of examination, it is recommended that men with erectile dysfunction, go to a regular hospital in time to avoid delays in treatment.