First, the couple preparing for pregnancy is older If the couple or one of them is older, more than or about to exceed the optimal age for childbearing, they should be treated at the same time, seize every opportunity to get pregnant, so as not to miss the best time; because even if the conventional medication is unsuccessful, the success rate of IVF will be limited by the age of the woman. A 25-year-old woman who ovulates normally and has a basic uterus and other conditions should have a success rate of about 50 percent for her IVF. However, by the age of 40, she has basically lost the ability to produce normal eggs. Even though we retrieve her eggs in vitro, her eggs do not have the potential to form a normal fetus, and after in vitro fertilization, an early embryo is formed, but it cannot develop, so the success rate is ultimately very low. The success rate is generally around 10%, and with every one or two year increase in age from the age of 40, the success rate decreases dramatically. After the age of 35, the androgen in the male body begins to decline, on average, every year after the secretion of testosterone decreases by 1%, and the probability of sperm gene mutation increases accordingly, the quantity and quality of sperm cannot be guaranteed, and the health of the fetus will also be adversely affected. Although age has a lesser degree of influence on men’s overall reproductive activities, with men starting to experience a decline in fertility from around 40 years of age, most people are still fertile after 50 years of age, but it may increase the risk of miscarriage in women. Second, the drugs have a lesser impact on the fetus Generally speaking, the woman takes drugs especially after pregnancy to continue to use drugs on the embryo has a greater impact. Most Western medicines will have a clearer contraindication related to pregnancy; Chinese medicine also has a contraindication for pregnant women, common contraindications for drugs are: spotted fibre, petunia, halberd, glycyrrhiza, coriander, Shanglu, musk, leeches, gadflies, senna, quinoa, toadstools, centipedes, wood turtle, raw Chuanwu and so on, cautionary drugs are the system of epiphyllum, guanzhong, peach kernel, safflower, rhubarb, citrus aurantium, dry ginger, cinnamon, motherwort, Fahsia, Changshan, Tiannanxing, etc. The main point of the above Chinese medicines is to avoid using them once you are pregnant. There is no clear research on whether taking them during pregnancy preparation will have any effect on the fetus, and the same is true for proprietary Chinese medicines. For men, if they are taking western medicines, there are usually more detailed instructions on the effects of the medicine on fertility; there are fewer instructions on Chinese medicines or proprietary Chinese medicines, and there is no clear research on whether taking them during fertility will have any effect on the fetus; however, past experience shows that men who get pregnant during the time they are taking Chinese medicines or proprietary Chinese medicines will not have any effect on the fetus. In summary, infertility patients in the drug treatment during the contraceptive or not, from their own health, age and medication and other factors to measure, not only to choose the best time to eugenics, but also try not to miss the limited opportunity.