With the full opening of the two-child policy, people’s concern about reproductive health is growing, and a recent news about the sperm quality of college students is worrying again focus people’s attention on male fertility. A, male sperm quality is declining trend It is understood that from the records of the only sperm bank in Hunan, the data of the first half of 2015 shows that the sperm quality of college students qualified rate of only 17.8%, compared to 2006 fell by nearly 30%. In fact, in recent years, the domestic male sperm quality showing a declining trend has long been found. As early as 2013, the Institute of Science and Technology of the National Population and Family Planning Commission found in a survey that the quality of male semen in China is declining at a rate of 1% per year, a drop of more than 40%, especially the more industrialized regions, the faster the decline in sperm quality. Scientists have warned: global human sperm quality per milliliter of semen sperm density has dropped from 131 million to 0.5 billion, a decline of 62%. It is understood that normal human semen contains sperm count 15 million to 200 million / ml, sperm count below 15 million / ml for oligospermia, in other words, 15 million / ml for the bottom line of new life, if lower than this number can cause male infertility. Second, the decline in sperm quality is not equal to no fertility Sperm quality decline does not mean you can not have children, for example, some men have less than 15 million / ml sperm count, but because of its sperm motility, but also normal fertility. In fact, the sperm quality standard to determine the normal health of the man in addition to the sperm count, but also includes the semen volume, color, liquefaction time, pH, sperm count, mobility and other factors, sperm quality decline, may be due to bad habits, affecting a sperm quality factors, does not affect their fertility, no need to panic. Only those with “azoospermia” or “severe oligospermia” will affect normal fertility. Likewise, the quality of sperm does not necessarily mean that you can have children. There are many factors that can affect infertility, such as genetic factors, chromosomal abnormalities, endocrine abnormalities, autoimmune diseases and so on. Therefore, sperm quality is not the “iron standard” for determining whether or not you can have a normal baby. The six factors can affect the quality of male sperm sperm quality decline is worrying, but the culprit of this fact is instead our own. The fact is that the sperm is not the only thing that can affect the sperm. The following six factors are the most common in life that have an impact on sperm quality: 1. Temperature. The most suitable temperature for the growth and development of sperm is the normal body temperature of the human body, however, in daily life, tight and impermeable underwear, jeans and hot baths and other bad habits, so that sperm often live in a high-temperature environment, seriously hindering the conception and growth of sperm. 2, tobacco and alcohol. Medical research has confirmed that the nicotine in tobacco reduces the amount of sex hormone secretion and has the effect of killing sperm, so often smoking, easy to cause the number of male sperm decreased. And alcohol can lead to a reduction in male gonad function, so that chromosomal abnormalities in the sperm, increasing the content of deformed sperm in the semen. 3, poor nutrition. The manufacture and growth of sperm require high quality protein, calcium, zinc and other minerals and trace elements, multivitamins, etc. If the diet is monotonous, paranoid, picky, etc., it will affect the survival of sperm. For example, a lack of zinc will cause a decrease in libido and sexual function, which will lead to a decrease in the number of sperm. 4, radiation. Such as nuclear radiation, X-rays, thermal radiation and electromagnetic radiation. It is understood that nuclear radiation has the most powerful destructive effect on the testicles, which can cause male spermatogenic disorders, and in serious cases can cause men to lose their normal fertility; and X-rays, some studies have shown that the premise of large doses can cause sperm deformities, low numbers, etc. 5, emotions. Some studies have shown that male sperm quality can be affected by the body’s emotions. When long-term depression, poor spirit, can directly affect the function of the nervous system and endocrine, so that the male testes production of sperm disorder, so that the number of sperm decreased. 6, drugs. Modern medical research proves that many drugs can cause male infertility. Such as sedatives, anti-tumor drugs, chemical drugs in Maryland, furan drugs, hormonal drugs can make testicular sperm production dysfunction.