Preconception health care is the provision of education, counseling, information and technical services to couples preparing to become pregnant at least 6 months prior to conception, providing the necessary screening, assessment, treatment and intervention to enable women to plan and prepare for conception in the best physical, psychological and environmental conditions. Preconception health care is a way to improve the planning of pregnancy, to guide the timing of pregnancy, and to remind couples to avoid exposure to factors that have adverse effects on the embryo and fetus before and after planned conception, from inadvertent injury to intentional avoidance, in order to reduce congenital defects, pregnancy complications and complications. （The purpose of the preconception general examination and health assessment is to understand the health condition of the couple before pregnancy and to assess the health of the couple through questioning, observation, physical examination and laboratory tests in the outpatient clinic. 1.Detailed information about age, medical history, menstrual history, marriage and childbirth history, social history, drugs, alcohol and tobacco, environmental pollution, including: biological, physical, chemical, living and working habits, occupational toxicity such as lead, toluene, benzene, etc., diet, obesity, malnutrition, exercise, domestic violence, family history and genetic history, etc. 2. Physical examination (both male and female) general condition, nutrition, weight, height, body mass index (BMI), skin drusen, hair, blood pressure, pulse, respiration. Systematic whole body examination: from head and neck, five ‘self’, chest and abdomen, limbs to reproductive system. Female reproductive system focus on examination of vagina, cervix, uterus, and adnexa. 3, auxiliary examination blood routine, blood type (AB () and RH system), urine routine, a full set of biochemical (including liver and kidney function, blood sugar, lipid metabolism indicators, electrolytes, etc.), hepatitis A, B and C antigens, antibodies, human immunodeficiency virus (HIV), syphilis serum screening (RPR), virus screening (TORCH, coxsackie virus, microvirus (B19 ). Female genital tract infection pathogens? Histocytology of the cervix. The pathogens of male genital tract infections depend on symptoms and signs. Other laboratory and imaging tests will depend on the consultant’s disease. (II) Preconception assessment and classification 1. Objective assessment of health care recipients based on the above inquiries, medical history, physical signs and auxiliary examinations for a comprehensive assessment. (I) Social assessment: determine whether there are risk factors affecting oneself and offspring based on sociological data, lifestyle, behavior, domestic violence, etc. (2) Fertility history assessment: current age, presence of infertility, habitual abortion, multiple abortions, etc., and assessment of the possible impact on pregnancy. (3) Family history assessment: the need for genetic counseling and assessment of the risk to the offspring. (4) Financial assessment: medical payment method, whether it affects the possibility of receiving health care medical treatment. (5) Nutritional assessment: assessment of nutritional status, whether there are problems with wasting, overweight, obesity, etc., based on BMI and biochemical measurements or other measurements as necessary, such as metabolic measurements, body composition measurements, etc.; assessment of whether dietary habits are reasonable and scientific. (6) Medical assessment: assess the impact on pregnancy, the impact of pregnancy on disease, and the impact of disease on the offspring according to the existing disease status, treatment, and medications. (7) Psychological assessment: the presence of psychological diseases, the impact of psychological state on pregnancy preparation, pregnancy and delivery, and psychological tolerance during delivery. (2) Assessment classification and treatment (1) Treatment of couples with problems found at the end. Pre-conception guidance: mainly pre-conception general mental and physical health guidance. Emphasize on reasonable nutrition, cultivate good eating habits, no partial eating and maintain normal weight. From 3 months before conception to 3 months after conception, you should take vitamin complex containing 0.4mg of folic acid once a day. Seriously abstain from smoking and alcohol, active and passive smoking can affect the growth and development of the fetus. Avoid exposure to unsafe factors and toxic and harmful substances in the living and occupational environment, such as radiation, heat, lead, mercury, benzene, pesticides. Keep away from pets, as cats and dogs can transmit toxoplasmosis, and Toxoplasma gondii infection in close contact with pregnant women can cause miscarriage and intrauterine growth retardation. After deciding to plan a pregnancy, adjust your contraceptive method. Those who take the pill daily should stop taking it. If you have an IUD, you should remove it. Usually, conception should take place 6 months after stopping the pill and removing the device in order to completely eliminate the pill and adjust the intrauterine environment, and other contraceptive methods such as barrier contraception (male or female condom) and natural contraception should be used during these 6 months. To correct dental diseases and pay attention to daily hygiene. Rubella and hepatitis B vaccinations should be given six months before pregnancy. Premature and late childbirth before the age of 18 and after the age of 35 should be avoided. Early childbirth, maternal immaturity and pregnancy complications are more likely to occur. In addition to a significant increase in the number of children born after the age of 35, the incidence of obstructed labor increases due to poor pelvic and ligamentous laxity and reduced elasticity of the pelvic floor and perineum. (2) Women with problems were found. (1) A history of adverse exposure (exposure to toxic and hazardous substances): delay childbirth and urge to leave the adverse living and working environment. (2) Age 35, history of infertility, history of poor fertility, genetic disease or family history of both partners should be examined and treated at infertility specialists or undergo genetic counseling and prenatal diagnosis. If you have a medical disease (heart, liver, lung, kidney) or a mental illness, you should go to the relevant specialist clinic for a clear diagnosis, treatment and guidance, and advice on whether you can have a pregnancy. Women with chronic diseases should be given drugs to change the treatment to avoid embryonic effects or congenital defects, such as chronic hypertension and diabetes mellitus, in order to conceive. ④Women with acute infectious diseases, infectious diseases of the reproductive system and sexually transmitted diseases should be treated in relevant specialties and advised to control or treat the diseases before having children. (3) Pre-pregnancy nutritional guidance 1. Nutritional assessment Assess the nutritional status according to the body mass index (BMI>), whether there are problems such as obesity, overweight or wasting; understand whether the dietary habits are scientific according to dietary habits and dietary analysis, etc. According to WHO standard BMI