Tubal obstruction is the main cause of female infertility, accounting for 25% to 35% of female infertility, while the main cause of tubal damage is pelvic inflammatory disease (PID). The incidence of secondary tubal obstruction is directly related to the incidence of PID. Fertility after tubal reconstruction depends on the site and extent of tubal injury. Women with extensive tubal damage have a lower chance of getting pregnant and IVF can improve their fertility rate. 1. Tubal lavage: It is the use of melanin or saline to inject from the cervix into the uterine cavity and then flow from the uterine cavity into the fallopian tubes, and to determine whether the tubes are open or not according to the amount of resistance and fluid reflux when pushing the fluid. Due to the advantages of simple equipment, easy operation and low price, this method was commonly used before the 1980s. However, since the whole process relies on the doctor’s subjective sensory judgment and cannot determine the location of tubal blockage, the tension during the examination can lead to tubal spasm, resulting in false positives. In recent years, the procedure can be performed under ultrasound monitoring, which has improved the accuracy rate, but in actual clinical work it is found that the method has a high rate of misdiagnosis, so it is not an ideal test. 2.Hysterosalpinography (HSG): It has been used in the 1920s and is performed by injecting a high specific gravity substance (such as iodine, pantopamine, etc.) composed of high atomic number into the uterine cavity through the cervical canal, which forms an obvious artificial contrast with the surrounding tissues under X-ray, making the cavity visible and detecting tubal occlusion, tubal motility, previous infection or tubal function. HSG has a sensitivity of 65% for tubal occlusion and adhesions, but pain-induced tubal spasm can cause false positives, and pain, infection, and invasion of contrast into the vascular system are rare complications. system are rare complications. Tuboscopy: It is a method to visualize the luminal structures of the fallopian tubes. In addition, tuboscopy can also be performed by transvaginal injection of water through the laparoscopic route into the abdominal cavity. 4.Laparoscopy: inject melanoma into the uterine cavity through the uterine catheter, and observe through the laparoscope that melanoma overflows into the pelvic cavity through the umbilical end of the fallopian tube, which is patulous; if there is a blockage of the proximal end of the fallopian tube (interstitial part of the fallopian tube and isthmus), no melanoma fluid overflows into the abdominal cavity through the umbilical end of the fallopian tube, and if there is a blockage of the distal end of the fallopian tube (abdominal part of the fallopian tube and umbilicus), the umbilical end of the fallopian tube and the abdominal part of the fallopian tube are seen to be dilated and thickened and blue, but no melanoma The fluid flow is from the umbilical end of the fallopian tube and into the abdominal cavity. Laparoscopy is the gold standard for the diagnosis of tubal obstruction, but it requires general anesthesia and surgical treatment, and is not commonly used at present. 5.Water injection laparoscopy: It is a new technique developed in recent years, which uses a small endoscope to explore the entire pelvic cavity from the posterior fornix pathway and requires the patient to adopt a bladder truncation position during the operation. The water-soluble tumescent used during the examination allows the uterus and the structures of the fallopian tubes-ovaries to be fully exposed during the back view. The ovaries and fallopian tubes remain in suspension throughout the procedure due to the constant drip of saline. The advantage of this technique is that it can be used on an outpatient basis and is more minimally invasive; the disadvantage is that the entire abdominal and pelvic cavity cannot be evaluated and there is a risk of damage to the intestines, with an incidence of approximately 0.65%.