Over the past half century or so, male sperm density has decreased by an average of 40% to 50%, and sperm vitality has also declined and is continuing to decline, with environmental pollution and occupational exposure being one of the major causes. Sperm from the occurrence, development, maturation to delivery and other physiological links need a suitable microenvironment. Among the various systems of the human body, the reproductive system is one of the more sensitive systems to toxic and harmful substances, and a very small amount of exposure to toxic and harmful substances may cause damage to the reproductive system. 1. Occupations involved in the study that are associated with decreased sperm quality Mainly drivers, chefs, sauna workers, welders, carpenters, decorators, oil workers, farmers, heavy computer workers and so on. 2, the root cause of the risk Occupation itself is not a risk factor, the harmful exposure behind the occupation or a specific environment is a risk factor, these factors are summarized mainly include: sedentary, high temperature, pesticides or other toxic substances, heavy metals, dyes, detergents or other chemical products, radiation, heavy manual labor, long-term mental stress and anxiety. 3, lifestyle habits are also related to the decline in sperm quality Common habits that may cause a decline in sperm quality are smoking, alcoholism, often sauna or hot bath, like to wear tight pants, heavy computer use, other factors such as excessive obesity may also lead to a decline in sperm quality. Decreased sperm quality can be manifested as decreased sperm count, decreased vitality, decreased fertilization ability, etc. These conditions may further lead to male factor infertility, but decreased sperm quality is not the same as infertility, nevertheless, we still recommend that men with occupational exposures to take certain precautions to address their fertility needs earlier, after all, age itself is also one of the risk factors for decreased sperm quality.