Smoking is not allowed during the preparation for pregnancy, and both husband and wife need to quit smoking. Smoking during the preparation of pregnancy may reduce the quality of sperm and eggs, and easily reduce the chances of conception, but also easy to cause fetal deformities or cause miscarriage after pregnancy. During the preparation for pregnancy, both men and women should prohibit smoking, and also try to avoid second-hand smoke during the entire period of pregnancy, but also pay attention to not drinking alcohol, as well as to avoid taking drugs. During the preparation for pregnancy, it is recommended to do a good preparation for pregnancy checkups, and at the same time adjust their own diet structure to pay attention to meat and vegetables, do not picky about food, as well as to avoid smoking and drinking alcohol, as well as random oral medication.