Assisted reproductive technology, also known as medical fertility, is a series of techniques that manipulate eggs, sperm, fertilized eggs, and embryos to ultimately treat infertility. These techniques can treat infertile couples to some extent for the purpose of fertility and are a major component of fertility regulation. They include techniques such as artificial insemination, in vitro fertilization-embryo transfer, intracytoplasmic single sperm injection, pre-implantation genetic diagnosis, semen freezing, and embryo freezing. Artificial insemination refers to a technique of inserting semen into the female reproductive tract through non-coital means for the purpose of conception. There are two types of artificial insemination: artificial insemination with husband’s semen and artificial insemination with donor’s sperm. In vitro fertilization-embryo transfer and its derivative techniques are assisted reproductive techniques that allow sperm and eggs to meet and fertilize outside the body and then transfer into the mother to achieve pregnancy. The first generation of IVF technology: i.e. conventional IVF technology, in vitro fertilization-embryo transfer is performed by using different protocols of ovulation-promoting drugs, and when the egg is mature, the egg is removed vaginally under ultrasound guidance and fertilized with treated sperm in a Petri dish, and the fertilized egg is cultured and developed to a certain stage outside the body and then transferred into the uterine cavity of the woman, where it will continue to develop into a fetus after implantation. Second generation IVF technique: The intracytoplasmic single sperm injection technique, except that at the time of fertilization, one sperm is injected directly into the cytoplasm of the oocyte using a microinjection technique to fertilize the egg. All other procedures are the same as conventional IVF techniques. It is suitable for patients with extreme oligospermia and weak sperm. Third generation IVF technology: i.e. pre-implantation genetic diagnosis technology, which refers to taking 1-2 cells from in vitro fertilized 8-cell stage embryos before transfer or taking the first polar body of the egg cell for genetic analysis before implantation, which can be used to identify the sex of the embryo, analyze the chromosomes of the embryo, and then transfer the embryo with normal genes and embryo screening to prevent genetic diseases. This results in eugenic reproduction. All other processes are the same as conventional IVF techniques. In fact, the classification of the first, second and third generations of IVF technology is wrong. It is reasonable that the second generation technology should be able to completely replace the first generation technology, but the fact is that they are just an additional operation to the conventional IVF technology, just like the relationship between WINDOWS and other application software, the conventional IVF technology is the technical operation platform. In fact, there are dozens of other technologies for assisted reproduction, all of which are variations on conventional IVF technology and cannot be divided by generation. Internationally there is no such thing as the first, second or third generation of IVF technology, only that the country likes it, probably for news hype. There is also a phenomenon that in the international arena, the third generation IVF technology was successful in 90 years, while the second generation IVF technology was successful in 92 years.