The purpose of pregnancy preparation is to conceive a healthy and smart baby, many couples preparing for pregnancy are prone to fall into the misconception that pregnancy preparation is a woman’s business and has nothing to do with men, in fact, it is not, during the preparation period, men do a good job of pregnancy preparation is necessary to conceive a healthy baby, then, how should men prepare for pregnancy? Pregnant couples should not be casual in their diet. In this competitive social mechanism, in order for their next generation to survive, the fathers-to-be, who have been through the frost of competition, know better than anyone else when considering their offspring that only physically strong, mentally healthy and intellectually developed children can take their place in the future competition without being eliminated. Responsible men who are ready to become fathers should strictly regulate their behavior and avoid exposure to substances that are harmful to sperm about 5 months before their wives are ready to get pregnant. 1, 2 to 3 months before pregnancy husband can not use drugs at will, not only the mother-to-be with drugs to be careful, husband randomly use drugs will also affect the baby! Under normal circumstances, there is a protective layer between the testicular tissue and the blood flowing through the testicles, medically known as the blood-testicle barrier. This barrier prevents certain substances in the blood from entering the testicles. However, many drugs can pass the blood-testis barrier and affect the healthy union of sperm and egg. For example, some common immunomodulators, like cyclophosphamide, nitrogen mustard and cisplatin, have strong toxic effects that can directly disrupt the synthesis of sperm DNA, including causing changes in the composition of genetic material, chromosomal abnormalities and sperm malformations. Drugs such as male infertility and habitual miscarriage (early embryo loss) in women are partly the result of damaged male sperm. These drugs can also be excreted into the vagina through sexual intercourse with the semen produced by the testes and absorbed by the vaginal mucosa and enter the circulation, increasing the incidence of low birth weight babies and malformed fetuses and increasing the perinatal fetal mortality rate. Therefore, in the 2 to 3 months before pregnancy and during pregnancy, the husband must be careful with drugs, if possible, it is best to stop using all drugs. 2, do not do “unqualified” dad, obese and malnourished dad is “unqualified”, especially obese, will affect the normal secretion of sex hormones in the male body, resulting in sperm abnormalities, so that the material basis of the embryo is affected. And malnutrition will directly affect the male reproductive function and fertility. 3, beware of the “Sunday baby”, some foreign experts put forward the “Sunday baby”, referring to those children conceived and born on the weekend, these children have poor intelligence, weak body. The reason for this is that holiday couples conceive after drinking. 4, quality sex life, research shows that the couple’s sexual life to reach the climax of conception, child quality is better, generally speaking, the wife’s menstrual period from day 12 to 18 days belong to the ovulation period, during this period of sex, the chances of pregnancy is high. When couples have sex, if the wife does not reach orgasm, it is recommended that the husband ejaculate outside the body, not immediately conceive, if the wife reaches orgasm, timely ejaculation effect is better.