During the ideal childbearing age, to choose the most favorable time for eugenics to conceive, attention should be paid to the following aspects: 1. Parents’ health is the basis of children’s health, so children should be conceived when the couple are both in good health. If one of the couple suffers from acute infectious diseases, tuberculosis, febrile diseases, or the wife suffers from serious diseases of the heart, liver, lungs, kidneys and other organs, they should not conceive. 2. In order to avoid the influence of certain unfavorable factors on the conception, any one of the couple should not conceive while he or she is taking medication for a certain disease. Oral contraceptives, should be stopped after 3-6 months before considering conception. Alcohol consumption is not suitable for conception. The toxic effect of alcohol on reproductive cells or fertilized eggs is very great. Couples who have intercourse and conceive after drinking a lot of alcohol will be born with underweight children, developmental delays, mental retardation and facial deformities. Creating a good environment for conception 3. The physiological and psychological state of the couple has a direct impact on conception. A quiet, harmonious and comfortable environment is good for people’s physical and mental health, and good for the development of reproductive cells and fertilized eggs. Therefore, should be in a pleasant climate, couples full of spirit, happy mood, should be avoided in the late fall, early winter season conception. Because this time the temperature is changeable, the mother is easy to catch a cold and sick, the baby deformity rate is higher than other seasons. 4, in the plan to conceive more than a month before, couples should strengthen nutrition, eat more high protein and vitamin-rich food, so that the germ cells develop well. 5, in the menstrual cycle of the first 14 days of intercourse, fertilization success rate is high, more than 92% success rate. After the 17th day of the menstrual cycle sexual intercourse conception, the abortion rate increases. 6, honeymoon conception is not conducive to eugenics. Young men and women always have to be busy before marriage, often very fatigue, so that both men and women in the energy and physical exhaustion, the newlyweds due to drinking and smoking, the quality of these reproductive cells will have a greater impact on the generation of. 7, honeymoon travel, do not easily pregnant. Because in the journey often early morning and late at night, irregular life, food and lodging is not guaranteed, rest and sleep insufficient, poor resistance, easy to catch a cold, on the newly developed embryo is not favorable.