With the increasing incidence of tubal obstruction in recent years, the number of infertility cases caused by tubal obstruction is also increasing. Studies at home and abroad have shown that proximal tubal recanalization can be achieved in at least 80% of tubal patients through non-surgical treatment. The choice of tubal imaging and tubal recanalization has been accepted by medical professionals and patients for its effectiveness, ease of operation and painlessness in the diagnosis and treatment of tubal obstruction infertility. Tubal obstruction is mainly due to inflammatory changes in the mucosa of the fallopian tubes caused by inflammation of the vagina or the cervix spreading upward through the endometrium, resulting in degenerative or patchy detachment of the tubal epithelium, leading to adhesion of the tubal mucosa and subsequent blockage of the tubal lumen or umbilicus. Traditional treatment is mainly tubal lavage or surgery. Although tubal lavage is simple, its accuracy is poor and the results are unsatisfactory, so it has been gradually eliminated; surgical microsurgery such as tubal implantation, anastomosis or ostomy is demanding, costly and inaccurate in terms of functional recovery. Mechanical tubal obstruction is the result of dislodged emboli and functional contraction of the organ. Common emboli include menstrual endometrial fragments and blood clots, and obstruction of the fallopian tubes due to uterine contractions and sudden release of negative uterine pressure during abortion, and embryonic tissue and embryonic appendages. There are also cases of tubal obstruction caused by the contraction of the tubal fluid; functional spasm occurs when the fallopian tube is stimulated, resulting in the contraction of the opening and the lumen of the tube and the formation of tubal obstruction. The most common cause of tubal obstruction is pathological obstruction. The most common cause is inflammation of the fallopian tube, which is caused by pathogens such as Staphylococcus, Streptococcus, Escherichia coli, Gonococcus, Aspergillus, Pneumococcus and Chlamydia. Tubal obstruction classification: 1, pass but not smooth: mainly due to intra-tubal debris, detached cells or blood clots obstruction; or tubal too slender curved; or tubal adhesion with the pelvic wall, adjacent organs, pulling the tubal activity. 2. Local incompetence of the fallopian tubes: more common, mostly due to local adhesions of the fallopian tubes. For patients with proximal incompetence, treatment by tubal recanalization is more effective. Patients with umbilical incompetence can be treated by laparoscopic cystoplasty. 3. Full or half incompetence of the fallopian tube: Most of them are caused by long delayed treatment or infection such as tuberculosis of the fallopian tube, which results in scarring, contracture and stiffness of the fallopian tube and irreversible functional changes. Treatment: 1. Selective tubal cannulography + recanalization via X-ray: selective tubal cannulography can clarify the specific site, degree and nature of tubal blockage compared with simple tubal cannulography, and can accurately understand the patency of the fallopian tubes while detecting the presence of tubal blockage, and can simultaneously perform recanalization treatment for patients with proximal blockage, and more accurately for patients with umbilical blockage. For patients with umbilical blockage, it can clarify the condition of the umbilical end of the fallopian tube and provide the basis for the next treatment. It can exclude pseudo-tubal incompetence due to uneven pressure of contrast agent. It is not recommended as the first choice because of the high economic cost and the use of inexpensive transx-ray hysterosalpingography. Usually, it is only for highly pregnant women with tubal blockage and a history of tubal pregnancy that tubal lesion examination and treatment can be done secondarily to reduce and avoid possible pain and injury to the patient. 2.Interventional tubal revascularization via X-ray and selective tubal imaging: not only can the specific site and nature of tubal blockage be clarified, but also can be revascularized while accurately understanding the site of tubal blockage. Interventional tubal revascularization via X-ray machine is a procedure that uses a coaxial catheter system to deliver a tubal catheter into the fallopian tubes through the vagina, cervix, uterine cavity and uterine horn for selective tubal imaging, and then delivers a coaxial catheter and a micro-guide wire through the tubal catheter to the fallopian tubes according to the specific site of blockage and the specific situation of the fallopian tubes, and recanalizes the blocked fallopian tubes through the micro-guide wire. Interventional tubal revascularization via X-ray is mainly applied to patients with tubal obstruction in the interstitial and narrow parts of the fallopian tubes. The one-time recanalization rate for patients with proximal blockage is 95% and the pregnancy rate is 60%. The interventional recanalization can be combined with physiotherapy and symptomatic treatment such as infection prevention. The left tubal recanalization shows good patency of the left tubalization. The right tubal recanalization shows good patency of the right tubalization.