With the full launch of the two-child policy, the detection rate of chromosomal abnormalities in fetuses has multiplied. Most human beings contain 23 pairs of chromosomes, and some people have chromosomal disorders due to missing or increased chromosomes, and these disorders cannot be treated by medication, and the birth of such children brings a great burden to families and society. Chromosomes are carriers of genetic material, and chromosomal abnormalities, as well as abnormal gene expression, eventually lead to abnormal development of the body. In other words, if the parents carry abnormal chromosomes or if a chromosomal mutation occurs during conception, it can be passed on to the child through the chromosomes. Chromosome examination can detect chromosomal abnormalities in the fetus at an early stage, which can effectively prevent the occurrence of genetic diseases. Generally speaking, fetuses with chromosomal abnormalities will be eugenically eliminated in early pregnancy, and a large proportion will have miscarriage or stillbirth, but still a small proportion will complete the whole pregnancy process. Such babies have congenital heart disease, mental underdevelopment, inability to take care of themselves, and inability to have children according to their genetic abnormalities, which have caused a significant burden to families, so it is important to check fetal chromosomes during pregnancy to early diagnosis and timely termination of pregnancy to achieve the purpose of eugenics. With the popularity of prenatal checkups, many parents will check the chromosomes of the fetus before the baby is born. Fetal chromosomal abnormalities are a very serious problem, and parents who have chromosomal abnormalities will choose whether the fetus is born or not according to the specific situation to ensure a healthy birth.