Diabetes mellitus is a systemic disease that involves multiple systems throughout the body and produces a variety of clinical symptoms. Long-term poor blood sugar control can also produce a variety of acute and chronic complications. The causes of sexual dysfunction in diabetic patients include the following: First, vascular lesions, diabetes can aggravate the occurrence and development of atherosclerosis and also microvascular lesions. Macrovascular and microvascular lesions can lead to insufficient blood supply to the cavernous arteries of the penis and symptoms of erectile dysfunction. Even a small number of men with diabetes are diagnosed with erectile dysfunction as the first symptom. Second, neuropathy, long-term poor blood sugar control will lead to a variety of neuropathy, diabetic plant neuropathy will affect sexual function, resulting in sexual dysfunction in diabetic patients. Third, long-term hyperglycemia will also affect the spermatogenic ability of the testes, affecting the quality of sperm, leading to a decrease in fertility of patients.