Erectile dysfunction (ED) etiology is divided into two main categories: psychological and organic. In the past, it was believed that psychological ED accounted for the vast majority, and with the progress of science and technology, the diagnosis of organic ED has been increasingly emphasized by using various advanced technical means to detect sexual function. In clinical work, it was found that the two main factors, psychological and organic, interact with each other, and a comprehensive, systematic and integrated investigation of their causes is the key to treatment. The psychological factors affecting erection are mainly the following: 1. Lack of correct sexual knowledge. Parents in their children’s adolescent development, not only did not carry out appropriate sex education, but always give reprimand or wrong answers to their children when asked about sex, resulting in a false perception of sex, after adulthood on normal gender relations, causing great psychological pressure, these situations may cause the occurrence of ED. 2, the couple’s relationship is not coordinated. Such as the failure of the first sexual intercourse, the wife is dissatisfied with her husband, so that the couple does not coordinate with each other, the husband with an unhappy mood to go to the house; or because the woman has a third party, the husband has hostility to his wife; or the man has an affair, the lack of interest in his wife, the woman failed to cause the husband’s sexual excitement and so on. The psychological factors that cause ED. 3, life by a huge mental trauma followed by depression and loss of confidence in life, this situation can cause ED. 4, the doctor’s wrong diagnosis and treatment. Men occasionally failed to have sexual intercourse, doctors hastily diagnosed as ED, and told it is difficult to cure, the result is that patients spend their days worrying about their sexual function, as if there is really no cure. This can all lead to erectile difficulties. In addition, there are some patients, due to other diseases, especially sexually transmitted diseases, after the cure is also worried about the “sequelae”, and performance in sexual life incompetence, etc.. The main organic factors affecting erection are: arterial occlusive disease, diabetes (can affect 75% of patients), neurological lesions, penile erectile tissue lesions such as penile fibrosis, pelvic radical surgery or trauma, side effects of certain drugs such as antihypertensive drugs, hypnotic sedative drugs, chronic diseases such as kidney or liver failure, abnormal hormone levels, alcoholism and drug abuse. It is important to note that long-term alcohol abuse can significantly affect sexual function, and studies have shown that small amounts of alcohol reduce the inhibition of sexual stimulation and enhance sexual sensitivity. The role of alcohol first inhibits the brain-controlled awe center, lifting the brain’s inhibition of sexual excitement, manifested as easy sexual excitement, to reach the threshold of orgasm to improve the time to extend. But a lot of alcohol will quickly inhibit human sexual behavior, the neurological testing of alcoholics found that long-term alcohol abuse affects the nerve conduction function, alcohol acts on the hypothalamus-pituitary-gonadal axis, inhibiting the pituitary gland to secrete gonadotropin, reducing the synthesis of testosterone in the interstitial cells, thus confirming that long-term alcohol abuse is more harmful to erectile function.