The meaning of blocking antibody is protective antibody IgG, which mainly exists in pregnant women, but when there is no antibody in pregnant women, it tends to cause lymphocytes to attack the pregnancy sac, causing infertility and infertility. The treatment is to extract the lymphocytes from the other male and inject them into the pregnant woman to form IgG protective antibodies after the immune reaction. When fertilization occurs again, because the body already has protective antibodies, it is able to protect itself from foreign anti-inflammatory reactions, which means that it is able to protect the gestational sac, and it will be able to prepare and conceive normally, so that is what is meant clinically. There are some patients who have infertility due to the absence of closed antibodies, and there are other causes, and it is important to choose a treatment plan according to the different causes.