Infertility is a common disorder among women of childbearing age, and the incidence of infertility has been on the rise in recent years. The World Health Organization (WHO) statistics show that infertile couples account for 7%-15% of couples of childbearing age, and the proportion is about 1/6 in China. Tubal factors mainly include structural abnormalities of the fallopian tubes, tubal dysplasia, non-specific inflammation of the fallopian tubes, various tubal surgeries, endometriosis, peri-tubal lesions such as adhesions and tumor compression of nearby organs after surgery, etc. Sexually transmitted diseases such as gonococcal, Chlamydia trachomatis and mycoplasma infections can also cause infertility, which may be due to damage of the fallopian tubes caused by infection. At present, there are several clinical methods for screening tubal infertility, such as laparoscopic tubal passage pigmentation, X-ray hysterosalpingography, ultrasonography, tubal microscopy and chlamydia serological testing. As each diagnostic method has its own advantages and disadvantages, adopting the most appropriate test strategy for diagnosing infertility patients is often one of the problems faced by clinicians. Tubal imaging is a method of examination in which contrast is injected into the uterine cavity and fallopian tubes through a catheter, and X-ray fluoroscopy and radiographs are taken with a diagnostic X-ray machine to find out whether the fallopian tubes are patent, the site of obstruction and the morphology of the uterine cavity according to the image of the contrast in the fallopian tubes and pelvis. It can diagnose tubal obstruction, uterine cavity adhesions, uterine developmental malformations, mucosal and submucosal disorders and other diseases. This method is simple, easy to perform, safe and has few complications. It is the ideal method to improve the diagnosis rate of infertility and has a therapeutic effect on tubal blockage at the same time. Indications: 1. Infertility with no abnormality in the husband’s semen, biphasic basal body temperature and good luteal function for 3 consecutive menstrual cycles without conception; 2. History of lower abdominal surgery such as appendectomy and caesarean section; history of pelvic inflammatory disease such as gonorrhea and puerperal infection; history of chronic appendicitis or peritonitis; endometriosis, etc., and suspected tubal obstruction due to infertility 3. observation of uterine cavity morphology to determine the presence of uterine malformation and its type, uterine cavity adhesions, submucosal fibroids, endometrial polyps and foreign bodies, etc.; 4. laparoscopic examination of extra-luminal adhesions of the fallopian tubes and preoperative examination for tubal plastic surgery, as this examination can further provide information on the condition of the fallopian tube cavity; 5. multiple mid-trimester spontaneous abortions and suspected incomplete endocervical atresia, in The endocervix should be observed for relaxation at the time of non-pregnancy. Contraindications: 1, iodine allergy, which is the strictest contraindication, when the iodine skin test is positive, combined hysteroscopy becomes the preferred method of examination; 2, those who cannot exclude pregnancy; 3, serious heart and lung diseases and normal pregnancy; 4, normal delivery, abortion, scraping or within 6 weeks after delivery, scraping the endometrium within 4 weeks; 5, during menstruation, when there is heavy or dripping bleeding from the uterus or cervix; 6. 7. acute and subacute inflammation of the reproductive system (such as trichomoniasis, mycobacterial, senile vaginitis, etc.), severe cervical erosion, endometritis, adnexitis, etc. Precautions: 1, the best time to do the imaging is 3-7 days after the clean menstruation; 2, 3 days before and 2 weeks after the imaging, avoid sexual intercourse and deep water bathing to prevent infection; 3, 1 month after the imaging contraception, does not affect the next month normal pregnancy.