Marriage, childbirth is a very important part of life, everyone wants healthy offspring, for this reason couples should be married according to the personal and social conditions of both parties, the expected time of birth of offspring, and make adequate preparations for this, both to ensure the health of the couple, but also to ensure the eugenics of offspring. If there is no pregnancy plan must be good contraception, according to statistics, the incidence of secondary infertility after abortion or medical abortion is 2%-5%. So what are the issues that should be noted before pregnancy? 1, the age of fertility: the wife conception age to 25-30 years old is appropriate, 25, 26 years old is the best age of conception. Ovarian function starts to decline after 35 years old, and declines significantly after 40 years old, and the infertility rate increases. 2, conception season: embryo about 3 months for the most rapid development of brain cells, is also the most in need of nutrition, so March, April, May conception is appropriate; June to August is the most abundant season of vegetables, fruits, eggs, meat, in addition to March to May when the climate is stable, early pregnancy is not easy to catch colds and other diseases. 3, do not conceive while traveling to get married: because the journey is not conducive to the development of the embryo and may easily cause miscarriage. 4, when preparing for pregnancy, the couple should keep their spirits high, emotionally happy and physically healthy. 5, vaccination: when preparing to get pregnant is not necessary to avoid vaccination, such as rubella, measles, cholera, etc. should be absolutely avoided. Hepatitis vaccine is a genetic synthetic vaccine, which is not harmful to the fetus, but should also be avoided during pregnancy. Of course, the vaccine must be administered when necessary for life-threatening diseases that cannot be avoided. 6, the couple should quit smoking and drinking during pregnancy. Some statistics 20-30 cigarettes per day, sperm deformity rate significantly higher, more than 30 cigarettes after the deformed sperm more. Alcoholism accelerates the metabolism of testosterone, causing testicular atrophy and impotence in severe cases. 7, should be away from the environment that is harmful to the fetus. Such as ionizing radiation, lead, mercury, gasoline, paint, sulfur dioxide, organophosphorus pesticides or anesthetics, etc. to avoid causing mutations in sperm and egg chromosomes. I hope everyone pays attention to the pre-conception preparation and does a good job in eugenics, which is good for the family happiness and the people’s prosperity.