Let’s take a look at the precautions for men to prepare for pregnancy. I. Factors affecting male sperm quality: After continuous research by scientists, many factors that can cause sperm DNA damage have been discovered, and all men must avoid the following factors. 1, environmental factors. Such as: high temperature, volatile chemical gases (including car exhaust, paint), noise, radiation, etc. 2, chemical exposure. Such as: benzene, mercury, cadmium, pesticides, etc. 3, disease factors. Such as: varicocele, tumor, allergic diseases, persistent fever, etc. 4.Drug factors. Such as: anti-tumor chemotherapy drugs, dermatological drugs (immunosuppressive drugs), etc. 5.Infection factors. Such as: testicular inflammation, epididymitis, seminal leukocytosis, etc. 6, bad life habits. Such as: excessive smoking, alcoholism, drug addiction, etc. 7, mental factors. Such as: the human body in a state of long-term mental tension, heavy burden of thought, excessive work pressure, emotional instability with anxiety, fear, etc. Second, male pre-fertility habits adjustment: 1, adjust the psychological state and maintain a positive, optimistic; 2, timely adjustment of life rules, work and rest, do not stay up late, to ensure adequate sleep; 3, increase outdoor physical exercise activities, to ensure a certain amount of exercise every day, away from obesity; 4, avoid high-temperature environment 5, quit smoking and limit alcohol, drink less too acidic beverages; 6, regular sex life: do not too often or too little. Third, the male pre-fertility diet considerations: in the diet, it is recommended to eat more high-quality protein to supplement amino acids, Chinese yam, eel, sea cucumber, crab, black fish, tofu skin, walnuts, sesame, etc. all contain more sperm important role in the production of arginine. Vitamins A, B, C and E play an important role in promoting sperm production and enhancing the vitality of sperm, and they are mainly found in animal liver, vegetable oils, green leafy vegetables and carrots, peas, tomatoes, lentils, pumpkins, potatoes, dates and fresh fruits. The trace elements also play a vital role in male reproduction. Studies have shown that zinc deficiency in the human body can lead to a decrease in the number of sperm and an increase in deformed sperm. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things. Fourth, the right season to help the birth of two children: scientists at the University of Rochester in New York analyzed the semen of men suffering from infertility and subfertility over a period of 32 months. The first results found that sperm with deformed heads were more often seen in the fall rather than the spring. This is due to the high temperature of the scrotum during the hot summer months, so that such malformed-headed sperm are released from the semen in the fall. The percentage of immature spermatozoa is higher in summer than in any other season, due to the heat. However, winter tends to make men’s sperm tails defective. Scientists point out that spring is the season when sperm tail defects occur most frequently. Secondly, in the study on sperm motility, it was found that autumn has the highest sperm motility, winter and spring have the highest number of sperm but are prone to tail defects, while summer has the highest percentage of immature sperm. This shows that it is not easy to get pregnant in the spring when everything is revived, because sperm with tail defects are less mobile and have difficulty reaching the egg to fertilize it. In general, the highest sperm count is in winter, followed by spring; the highest sperm automaticity is in autumn and winter. Sperm quality varies from season to season, and British scientists suggest that men are well advised to choose the summer months for infertility treatment. V. Examination before male fertility: 1. Semen examination: 3-7 days of abstinence, check sperm count, vitality, malformation rate, acrosome function, sperm DNA fragmentation rate, and white blood cells, etc. 2.Sexual function assessment: sexual function gradually declines with age and can be improved through treatment. 3.Chromosome examination for both spouses: it is more important for couples with particularly low sperm count or high malformation rate and previous history of bad pregnancy and delivery. 4, thalassemia testing: Some provinces in China, such as Guangdong, are areas with a high prevalence of thalassemia gene carriers, and it is feasible for both partners to have problems with third generation IVF technology PGD to select healthy offspring. 5.Sexually transmitted diseases and some infectious diseases, such as hepatitis, syphilis, AIDS, etc. Six, for fertility difficulties, drug treatment still can not naturally pregnant, with the help of assisted reproductive technology: 1, erection, ejaculation and other sexual dysfunction: natural pregnancy failure can choose artificial insemination. 2, few, weak, deformed sperm: anti-inflammatory, antioxidant, endocrine stimulation treatment can be carried out, and those who still cannot get pregnant naturally after treatment can take the appropriate assisted reproductive technology in combination with the female partner. 3.Azoospermia: If it is an obstructive factor, testicular and epididymal puncture for sperm extraction can be chosen, combined with the second generation IVF technology to help pregnancy.