Men need to pay attention to six points before preparing for pregnancy, as follows: 1, avoid testicles in an overheated environment: such as hot tub baths, saunas, which can affect the deep development of testicles and increase the rate of malformation. Avoid wearing tight underwear, testicles in a cool environment in the best function, sperm activity, quality is the best; 2, quit smoking and alcohol: tobacco and alcohol can lead to decreased sperm quality, sperm deformity, such as long-term large number of cigarettes can affect the maturation of spermatozoa, resulting in sperm deformity, a large number of alcohol abuse can reduce sexual function, affecting the chromosomes of spermatozoa, increasing the rate of aberrations; 3, dietary attention to balanced nutrition: more fresh, hygienic food, avoiding Overeating, maintain weight within the normal range; 4, healthy married life: too frequent, too sparse can affect the quality of sperm; 5, away from rays, drugs: a large number of rays can cause changes in the quality of sperm, deformity occurs. Drugs can affect sperm development, such as anticancer drugs, tranquilizers, hormone drugs, dermatological drugs; 6, maintain a good, healthy, optimistic mood.