It involves injecting the semen of the male partner into the uterine cavity of the female partner through a special catheter after treatment to achieve pregnancy. Who is suitable for IUI? 1, male infertility due to oligospermia, weak semen, liquefaction abnormalities, sexual dysfunction, genital abnormalities, etc.; 2, cervical factor infertility; 3, reproductive tract abnormalities and psychological factors leading to infertility such as sexual intercourse; 4, immune infertility; 5, infertility of unknown origin.