Erectile dysfunction is actually a lot of men will encounter, not only will affect their gender life, but also let men produce low self-esteem, but many people do not know why men will encounter erectile dysfunction problems, the following we we will go into detail to understand what factors are caused. The survey shows that among men aged 40-70, 52% have varying degrees of erectile dysfunction, most of which are related to disease in older people. The incidence of erectile dysfunction among common diseases is 64% for diabetes, 61% for heart disease, 52% for hypertension, 86% for prostate surgery, and 90% for depression. In 1999, the American Heart Association clearly stated that “diabetes is a cardiovascular disease”. 2001 American Cholesterol Education Program, diabetes was listed as an equal risk lesion for coronary heart disease. This is because: 1. Diabetes is not only an abnormality of glucose metabolism, but also an abnormality of glucolipid metabolism. Hyperglycemia often coexists with multiple risk factors such as dyslipidemia, abnormal blood pressure and obesity. After the onset of diabetes, the risk of cardiovascular pathology is further increased. 2, Compared with the general population, the risk of coronary heart disease increases 2-3 times in the diabetic population. 3. Diabetes is essentially a cardiovascular disease, and the greatest threat is in vascular lesions, such as cardiovascular disease and peripheral arterial obstructive lesions, in addition to microangiopathy. Therefore, diabetes treatment should control blood pressure, blood lipids and blood sugar at the same time in order to stop the development of diabetes and cardiovascular disease, which has been the modern concept of treating diabetes. The incidence of erectile dysfunction secondary to diabetes mellitus is 64%, the principle of which is simply that diabetes mellitus is caused by damage to the arterial vessels, the reduction of blood supply to the pubic arteries per unit of time and the slowing down of arterial blood flow and flow rate, even if the conditions of sexual stimulation exist, the effective blood perfusion of the penile arteries is insufficient to form erectile difficulties. This is manifested as a difference in the degree of mild, moderate and severe. Therefore, erectile dysfunction is a phenomenon or precursor of the impairment of bodily functions caused by these diseases (such as diabetes). Effective treatment and control of primary diseases such as diabetes is fundamental to address erectile dysfunction in the elderly. From these introductions we can see that the cause of male erectile dysfunction is not only caused by reproductive diseases, there are also life while some diseases that can also lead to male sexual function is affected, so want to have harmonious sex, in addition to pay attention to gender health care, but also pay attention to their own physical health.