I. The main elements of preconception health care include: 1. Prepared and planned pregnancies and avoidance of pregnancies at an advanced age. Generally speaking, the best time to have a child is between the ages of 23 and 30 for women and 30 to 35 for men, and it is best for women to be no older than 35 and men no older than 40. The child’s organism comes from the parents and undergoes the initial stage of growth and conception in the mother’s body. Therefore, the age of the parents will have a certain impact on the intellectual development of the child, which mainly depends on the differences in certain genetic qualities of both parents. 2. Reasonable nutrition and control of body mass (weight) gain. It is in the best interest of eugenics for women to have children above and below their standard weight. If a woman’s weight is less than 15% of the standard weight, she is too thin; if she is more than 20% above the standard weight, she is too fat. Too fat or too thin will make the body’s endocrine function is affected, is not conducive to conception, and easy to complicate pregnancy after pregnancy hypertension syndrome, gestational diabetes and other pregnancy-related diseases. Too light weight may give birth to a low birth weight child, too fat may suffer from high blood pressure, diabetes and other complications during pregnancy. Therefore, women who are ready to get pregnant, no matter whether they are too fat or too thin, should actively adjust their body weight and strive to achieve a normal state. How to adjust weight? Women who are underweight should pay attention to increasing the intake of high-quality proteins and fat-rich foods, such as chicken, duck, fish and meat, eggs and soy products. Overweight women, in addition to active weight loss exercise, early consultation with a nutritionist to develop a reasonable recipe, control calorie intake, eat less greasy and sweet food, and strive to reduce weight to the normal range. 3. Supplement folic acid 0.4-0.8 mg/d. Pregnant women with previous neural tube defects (NTDs), such as anencephaly, spina bifida, cleft lip and palate, etc., need to supplement folic acid 4 mg per day, or under the guidance of a doctor to supplement folic acid. 4.Women who have genetic diseases, chronic diseases and infectious diseases and are preparing for pregnancy. They should go to the hospital for a comprehensive examination and be evaluated and guided by a professional doctor. 5.Reasonable use of drugs, avoid the use of drugs that may affect the normal development of the fetus. Both parties need to be careful with drugs in the first trimester of pregnancy, read the instructions carefully before using drugs, and use drugs reasonably. 6, avoid contact with living and occupational environment of toxic and harmful substances (such as radiation, high temperature, lead, mercury, benzene, arsenic, pesticides, etc.). Avoid close contact with pets. 7, change bad habits (such as smoking, alcoholism, drug abuse, etc.) and lifestyle; avoid high-intensity work, high-noise environment and domestic violence. 8. Maintain mental health, relieve mental stress, and prevent the occurrence of psychological problems during pregnancy and after childbirth. Reasonable choice of exercise to maintain a good physical and mental state. Routine health care 1. Evaluate pre-pregnancy high-risk factors: (1) Ask about the health status of the couple preparing for pregnancy. (2) Evaluate the history of previous chronic diseases, family and genetic history, those who are not suitable for pregnancy should be informed in time. (3) Detailed knowledge of adverse maternal history. (4) Lifestyle, diet and nutrition, occupational status and working environment, exercise (labor), domestic violence, and interpersonal relationships. 2. Physical examination: (1) Including measurement of blood pressure, body mass, and calculation of body mass index (BMI), BMI = body mass (kg)/height (m). (2) Routine gynecological examination. Auxiliary examination 1. Physical examination program: including the following items: (1) blood routine; (2) urine routine; (3) blood type (ABO and RH); (4) liver function; (5) renal function; (6) fasting blood glucose; (7) Hepatitis B five; (8) syphilis spirochetes; (9) HIV screening; (10) cervical cytology (for those who haven’t been examined for 1 year). 2. Eugenics Program (1) Screening for Toxoplasma, Rubella, Cytomegalovirus and Herpes Simplex Virus (TORCH). (2) Cervico-vaginal secretion examination (routine vaginal secretion, gonococcus, chlamydia trachomatis). (3) Thyroid function test. (4) Glucose tolerance test should be performed for those with family history of diabetes or overweight. (5) Gynecological ultrasound examination.