With the full opening of the two-child policy, people’s attention to reproductive health is growing, and a recent news about the worrying sperm quality of college students once again focuses people’s attention on male fertility. First, male sperm quality is a declining trend It is understood that, from the Hunan only sperm bank records, the first half of 2015 data show that the sperm quality of college students qualified rate of only 17.8%, compared with 2006, a decline of nearly 30%. In fact, in recent years, the declining trend of male sperm quality in the country has long been recognized. As early as 2013, the Institute of Science and Technology of the National Population and Family Planning Commission found in a survey that the semen quality of men in China was declining at a rate of 1 percent per year, a drop of more than 40 percent, especially in areas with a higher degree of industrialization, where sperm quality is declining at a faster rate. Scientists have warned: global human sperm quality per milliliter of semen sperm density has fallen from 131 million to 0.5 billion, a decline of 62%. It is understood that the normal human semen contains 15 million to 200 million sperm / ml, sperm number is less than 15 million / ml for oligospermia, in other words, 15 million / ml for the bottom line of the new life, if less than this number can cause male infertility. In other words, if the sperm count is lower than this number, it can cause male infertility. 2. Decrease in sperm quality is not equal to the lack of fertility. Decrease in sperm quality doesn’t mean that you can’t have children. In fact, in addition to sperm count, the normal healthy sperm quality standard also includes semen volume, color, liquefaction time, acidity, sperm count, motility and other factors. Decrease in sperm quality may just be due to bad lifestyle habits, which affects one of the sperm quality factors, and doesn’t affect their fertility, so there is no need to panic. Only those with “azoospermia” or “severe oligospermia” will affect normal fertility. Similarly, having good sperm quality does not necessarily mean that you will be able to have children. There are many factors affecting infertility, such as genetic factors, chromosomal abnormalities, endocrine abnormalities, autoimmune diseases, etc. Therefore, sperm quality is not an indicator of fertility. Therefore, sperm quality is not an “iron standard” for determining whether a man can have children. 6 Factors that can affect sperm quality in men The decline in sperm quality is worrying, but the culprit for this fact is us. In addition to congenital factors such as congenital azoospermia, many of these factors are caused by human factors. The following six factors are the most common in life have an impact on the quality of sperm: 1, temperature: sperm growth and development of the most suitable temperature is the body’s normal body temperature, however, in our daily lives, tight impermeable underpants, jeans and soak in a hot bath and other bad habits, so that the sperm often live in a high-temperature environment, a serious impediment to the sperm conception and growth. 2, tobacco and alcohol: medical research has confirmed that the nicotine in the tobacco reduces the secretion of sex hormones and has the effect of killing sperm, so often smoking, easy to cause men to reduce the number of sperm. And alcohol can lead to the male reproductive gland function is reduced, so that the chromosomal abnormality in the sperm, increase the content of malformed sperm in the semen. 3, malnutrition: the manufacture and growth of spermatozoa require high-quality protein, calcium, zinc and other minerals and trace elements, a variety of vitamins, etc. If the diet is monotonous, partiality, picky eaters, etc., it will affect the survival of spermatozoa. For example, lack of zinc will make libido and sexual function decrease, which will lead to the reduction of the number of spermatozoa. 4, radiation: such as nuclear radiation, X-ray, thermal radiation and electromagnetic radiation. It is understood that nuclear radiation has the most powerful destructive effect on the testicles, which can cause spermatogenic disorders in men, and in severe cases, men can lose their normal fertility; and X-rays, studies have shown that large doses of the premise can cause sperm deformities, low numbers and so on. 5.Emotions: Some studies have shown that the sperm quality of men will be affected by the body’s emotions. When long-term emotional depression, poor mental health, can directly affect the function of the nervous system and endocrine, so that the male testes to produce sperm function disorders, so that the number of sperm reduced. 6, drugs: modern medical research has proved that many drugs can cause male infertility. Such as sedatives, anti-tumor drugs, chemical drugs in the Maliran, furan drugs, hormone drugs can make testicular spermatogenic dysfunction.