Preparing for pregnancy to eat food to ensure nutritional balance is the best, there is no which is the best. Preparing for pregnancy during the diet need to ensure that the nutrition is comprehensive and balanced collocation, daily intake of appropriate amount of cereals, meat, fish, fresh vegetables and fruits, eggs and fats, dairy, etc., not picky and not partiality, as little as possible to eat unhealthy food, prohibit smoking and alcohol. Supplementation of folic acid during preparation for pregnancy can prevent fetal neural tube malformations and can reduce the probability of fetal birth defects. It is usually required to start supplementing folic acid from the third month before conception so that the folic acid can reach a certain blood concentration during pregnancy, which will theoretically have a better protective effect and it is also recommended to supplement folic acid every day for the first 3 months after pregnancy. During the preparation period, both husband and wife need to adjust their nutrition, living habits and health condition to achieve the best possible state.