Preparation for pregnancy refers to women of childbearing age to plan for pregnancy and make the necessary preparations for eugenics, is an important prerequisite for eugenics and eugenics. First, pre-pregnancy weight should be to the appropriate level Women preparing for pregnancy should adjust their weight to the appropriate level. Being thin or fat will reduce the chance of pregnancy. Thin people can appropriately increase the amount of food intake, such as milk, fish, meat and so on. Obese people should change their bad eating habits, control their calorie intake properly, eat less greasy and sweet food, and increase exercise. Second, supplement a variety of nutrients 1, eat more iron-rich physical: animal blood, liver, lean meat in the iron content level iron absorption rate are higher, while the intake of vegetables and fruits containing more vitamin C, can improve the absorption and utilization of dietary iron. 2, 3 months before pregnancy began to supplement folic acid: folic acid in addition to help prevent fetal neural tube malformation, but also conducive to reducing the risk of pregnancy hyperlipidemia. Pregnant women should supplement 400μg of folic acid every day. 3, choose iodized salt: iodine is an indispensable trace element for the synthesis of thyroid hormones, in order to avoid the adverse effects of iodine deficiency during pregnancy on the intellectual and physical development of the fetus, prepare for pregnant women in addition to the regular consumption of iodized salt, and then once a week intake of iodine-rich foods, such as seaweed, seaweed, etc., in order to increase the iodine reserves of a certain amount. Third, prohibit smoking and alcohol, maintain a healthy lifestyle Smoking and drinking affects the health of conception and the next generation. Alcohol can cause sperm fire egg deformity, the formation of abnormal fertilized eggs at the time of conception, affecting the successful implantation of fertilized eggs and embryonic development, easy to lead to miscarriage. A healthy lifestyle is conducive to improving the quality of fertility and achieving a good pregnancy outcome.