The causes of tubal obstruction are usually the following: 1. Non-specific pelvic infection: the causative microorganisms include various bacteria, chlamydia, mycoplasma and viruses; the occurrence of pelvic inflammatory disease is related to the decline of the body’s resistance, lack of attention to personal hygiene, sexual life factors, as well as gynecological and obstetric surgery, contraceptive measures and other factors; with the increase in sexually transmitted diseases and abortion, especially premarital abortion, the proportion of non-specific pelvic infections caused by With the increase of sexually transmitted diseases and abortion, especially premarital abortion, the proportion of tubal infertility caused by non-specific pelvic infections is also increasing; and Mycoplasma solium (UU) and Chlamydia trachomatis (CT) infections are especially common, which cause pelvic membranous adhesions, tubal scar formation and tissue damage, and patients often have no obvious symptoms and no abnormalities in general examination; however, some tubal umbilical adhesions with surrounding tissues can be found under laparoscopy or tubal iodography, forming However, laparoscopy or tubal iodine imaging may reveal that some of the tubal umbilical ends are adhered to the surrounding tissues, forming tubal effusion; some of the tubal umbilical ends are adhered to the ovaries and penetrate, with fluid leaking out to form inflammatory tubal-ovarian cysts; some of them are clearly seen to be completely obstructed or not open. 2, tubal pregnancy: obstruction or patency after conservative treatment or surgery for tubal pregnancy leads to infertility or another ectopic pregnancy. 3.Pelvic endometriosis: due to the role of ectopic endometrium or tubal adhesions and poor patency, individual tubal obstructive infertility due to endometriosis. Tubal tuberculosis: In pelvic tuberculosis, almost 100% of the fallopian tubes are involved, making tubal obstruction irreversible, mostly in the form of stiffness, nodularity, and partly in the form of cheese-like masses or peritoneal corn-like nodules. 5. Uterine fibroids: Uterine fibroids can also compress or pull the fallopian tubes, deforming or ectopic them, causing infertility.