Primary infertility is defined as never having conceived and secondary infertility is defined as having been pregnant and then becoming infertile. There are many causes of infertility, and pregnancy is not the result of one person, but requires both men and women to be normal in order to get pregnant. Girls need to check whether their fallopian tubes are open, whether ovulation is normal, and whether there is immune infertility, while men need to check whether their reproductive organs are developing normally, and what is the quality of sperm. Pregnancy is a comprehensive factor and requires many tests. Men need to have ultrasound to check whether their genital organs are developing abnormally, and they also need to have sex hormone check and sperm quality check; women need to have vaginal and cervical check, fallopian tube check, sex hormone check, ultrasound to check whether ovulation is normal and the development of uterus. In addition to physical diseases, infertility is also related to environmental pollution, unhealthy diet and stressful life and work, as well as frequent drinking and smoking and taking emergency contraceptives.