According to the World Health Organization, couples who have had normal sexual intercourse without any contraceptive measures for more than 1 year and whose female partner is infertile due to male factors are considered as male infertility. According to the guidelines for the diagnosis and treatment of male infertility, the main causes of male fertility decline are: congenital and acquired genitourinary tract malformations, reproductive tract infections, varicocele, endocrine disorders, genetic defects and immune factors. It may seem clear at a glance, but the causes may be multifaceted and not easy to treat in a specific patient. There are also unknown causes, also called idiopathic infertility, refers to the application of the existing means of examination of both husband and wife are no obvious abnormalities, but did not conceive a child; or, the examination is simply male semen quality is not good, semen analysis shows less sperm, weak sperm and deformed sperm, but do not know what causes, called “idiopathic semen abnormalities”. In 2002, a sample of six counties and cities in Guangdong Province found that the average incidence of infertility was 14.7%. A few decades ago, there were only 5-8 infertility problems for every 100 couples. In the past, people often point to the female partner as the reason for “failure to have children,” but according to a survey by the World Health Organization, 30% of infertility is caused by the male partner alone, while 20% is shared by both men and women. This means that the male factor accounts for half of the infertility. This is the reason why our department emphasizes “male and female treatment together”. The semen of men is indeed changing. Danish scholars compared the quality of semen of men between 1940 and 1990 and found that the number of sperm decreased dramatically. In 1940, the number of sperm per milliliter of male semen was 113 million, but by the 1990s, only 66 million remained, a reduction of about half. The Institute of Science and Technology of China’s Population and Family Planning Commission, which collated and analyzed data from 39 cities and counties, including Beijing and Shanghai, showed that the quality of male semen in China is also declining at a rate of 1% per year, with the number of sperm dropping by more than 40%; and the higher the degree of industrialization, the more obvious the reduction in sperm quality in the region. The more industrialized the area is, the more significant the decrease in sperm quality. The first thing affected by the decrease in semen quality is male fertility. A semen test, it is difficult to determine the “life and death” World Health Organization had a survey, researchers on some fertile men fortnightly semen examination, the results found that the highest number of sperm, up to 100 million, but some patients, if the examination, just in the cold or tired state, the sperm count may The sperm count may drop to more than 2 million in one go. Therefore, the semen test data fluctuates, so you can’t use a report card to determine life and death, but multiple reviews can tell you the approximate range of your semen quality. Even if the semen test is abnormal, it cannot be said to be infertile, only that its semen quality is poor and fertility is low, but the possibility of fertility is still there. Moreover, even if all tests (including semen tests) are normal, the factors that cause infertility in men cannot be ruled out, which would fall into the category of idiopathic infertility mentioned earlier. In fact, the real value of semen analysis is only to facilitate the physician to distinguish between three states: low fertility, uncertain fertility and good fertility. If a patient is found to have oligospermia (total sperm count less than 15 million/ml), or weak sperm (total sperm motility < 40% or forward-moving sperm < 32%), or teratozoospermia (normal-form sperm < 4%), fertility is low, but not necessarily infertile. If the male partner belongs to severe oligospermia, or even azoospermia, or severe weak spermatozoa or deformed spermatozoa, it is difficult to shirk the responsibility of infertility. However, fertility is a "cooperative project" of the couple, if the woman's health is better, it can play a role in compensating for the low fertility of men. Like some couples who have been married for many years without children, the result of divorce, each reunited family, but with the new spouse had children. This may be because they were "weak" together, and the second marriage was a "strong" combination, so that the "fruit" was repaired. A study once showed that farmers, workers in the chemical and heat industries, electrical engineers, property analysts, computer managers and teachers with high exposure to pesticides were more likely to develop fertility disorders. Of course, patients are not likely to give up their jobs because of this. However, there are some changes that can be made in life, such as wearing tight pants, smoking, alcoholism, staying up late all the time, etc. In addition, we should also understand some basic knowledge of fertility, such as: do not wait until ovulation to have sex, more than 7 days without sperm, sperm aging, but the quality of decline. In the ovulation period can be appropriate to increase the number of sexual life and so on. varicose spermatozoa, should be done varicose spermatozoa, will make the testicles sperm production function affected, and with the extension of time becomes serious. If varicose spermatozoa are found in men in their 20s, 70% of them can still have good sperm production function; but if varicose spermatozoa are still present over the age of 35, the quality of semen may decrease because the sperm production of the testicles is affected for a long time and the natural degeneration of testicular function, and fertility may be reduced. Therefore, adult men, even if they have no plans to have children, should be treated if they have abnormal semen tests along with varicocele.