The fallopian tubes have the role of transporting sperm, picking up eggs, and transporting fertilized eggs to the uterine cavity. If the tubes are inaccessible or dysfunctional, female infertility may result. Tubal infertility accounts for about 1/3 of the causes of female infertility. Specific causes are divided into the following points: 1, tuberculosis tubalitis, mostly secondary infection of pulmonary tuberculosis or peritoneal tuberculosis, accounting for 10% of the causes of infertility. Mainly through the bloodstream infection, part of the lymphatic system and direct spread of infection. Tuberculosis firstly infects the muscular layer or submucosal layer, and then develops to the mucosal and plasma layer, which makes the fallopian tube slightly enlarged, the wall of the tube thickened, and the surface of the tube may show most of the corn-like nodular lesions, and the adhesion with the surrounding, and the endotubal lining is infected by tuberculosis, and the mucous membrane is destroyed, which forms the thousand caseous necrosis and adherence. The lesions mainly invade the distal end, and the mucosa of the umbrella end is swollen and turned out in the shape of a funnel, which may not be atretic. If secondary infection occurs, the tube may become purulent, and tuberculous tubal periadenitis can be formed, which can be widely adhered to the surrounding organs, and the superficial lesions can be deepened into the interstitial and mucosal tissues of the tubal wall, resulting in infertility. 2, gonococcal salpingitis In recent years, chlamydia and mycoplasma infections have been found to cause an increase in the proportion of pelvic inflammatory disease, as with gonorrhea on the fallopian tubes is the effect of upward infection along the mucous membranes, through the cervical canal lining, the endometrium, the tubal lining to the pelvic peritoneum, but generally there is no acute stage, and the symptoms of infection at the beginning of the symptoms are mild, so do not pay attention to it, and finally lead to tubal blockage. 3, septic tubal infection is common in incomplete abortion, abortion and puerperal infection. The pathogenic bacteria are Staphylococcus pyogenes, Streptococcus pyogenes, Escherichia coli and Pseudomonas aeruginosa, which cause interstitial tubulitis, isthmus nodular tubulitis, hydrosalpinx and tubal pus. 4.Abnormalities in tubal development Congenital abnormalities in tubal development such as tubal dysplasia, curved and twisted tubes and tubal diverticulum can cause abnormalities in the function of tubes in transporting ova, sperms and fertilized ova, making it easy for infertility and tubal pregnancy to occur. Knowing the above reasons, in the prevention of tubalitis can be targeted, accurate “sniper” tubalitis.