Women smoking is harmful to pregnancy. Not only does a woman’s smoking affect her chances of getting pregnant, but it may also affect the quality of the fetus, affecting the course and outcome of the pregnancy, and it is important to abstain from smoking during preparation and pregnancy. Smoking is harmful to a woman’s health at any time, especially during preparation and pregnancy, and is likely to affect the formation and quality of eggs, leading to infertility, as well as a significantly higher chance of fetal malformation, which can also lead to increased chances of miscarriage and preterm labor, so a woman must be careful to avoid smoking, and also try to avoid exposure to second-hand smoke. Eugenics also requires women to avoid operating toxic and harmful jobs, not to go to polluted environments, pay attention to nutrition, and try to stay optimistic before preparing for pregnancy and during pregnancy. From at least three months before the preparation for pregnancy should be supplemented with folic acid, actively do a good job of pre-pregnancy checkups, any abnormalities should be corrected as soon as possible.