Tubal obstructive infertility is an important cause of female infertility, accounting for about 30% to 50% of female infertility as reported in the literature, and its incidence is increasing with the increase in the number of abortions. Tubal obstruction recanalization is a concise and effective method to treat tubal obstruction, and the literature reports that it is mainly performed by catheter guidewire recanalization, with a success rate of about 90% and a conception rate of about 30%. Materials and methods 1. General data 157 patients, aged 22-40 years, with a mean age of 28.7 years. There were 34 cases of primary infertility, 123 cases of secondary infertility, and 109 cases of secondary infertility with history of abortion or medication abortion, accounting for 89%. There were 306 obstructed fallopian tubes and all cases were confirmed by hysterosalpingogram. In all cases, tubal obstruction was confirmed by hysterosalpingography. 2. Blood cell analysis and coagulation tests were routinely performed before surgery. 3.Use the coaxial catheter of the tubal recanalization kit. The 9F double-balloon catheter does not use a balloon, but only serves as an intrauterine support. 5.5F single-curved catheter is introduced through the 9F catheter, and the 0.035in guidewire is used to guide the catheter to reach the opening of the fallopian tube on one side for secondary support. A 3F microcatheter was introduced via a 5F catheter and selected to enter the fallopian tube about 0.5cm under 0.018in guidewire guidance and pushed with contrast agent under pressure until the contrast agent was completely free from the human peritoneal cavity. 100ml of tinidazole, 0.1 of Zocor, 5mg of dexamethasone and 4ml of placental tissue fluid were mixed thoroughly as the treatment fluid and pushed in the fallopian tube under pressure to consolidate the treatment. For proximal obstruction, consider introducing guidewire recanalization if the contrast agent pressure does not lead to successful tubal recanalization; for distal obstruction, if the lumen is dilated and fluid accumulates after pressure method, slowly add pressure under fluoroscopic observation, and if the contrast agent can travel distally and the lumen tension is not significant, maintain the pressure until recanalization is successful. If the contrast agent accumulates locally, the tubal tension increases and the patient has obvious abdominal pain, the recanalization is abandoned and the second stage laparoscopic treatment is proposed after the operation. 4. Antibiotics were routinely applied after interventional recanalization, and one uterine lavage was performed on the second postoperative day when there was no vaginal bleeding. The comprehensive imaging performance of the fallopian tube and the contrast agent after freeing into the peritoneal cavity after recanalization was graded, and according to the different grades, 1 to 3 menstrual cycles of uterine lavage, herbal enema, physiotherapy, lateral injection and even laparoscopy and IVF treatment were arranged by the professional fertility physicians. Follow-up visits were performed from 6 to 9 months after the operation to observe the conception. Results 1. 306 obstructed fallopian tubes were recanalized by liquid pressure method in 157 cases, and 286 of them were successfully recanalized, with a success rate of 93.5%. 274 of the 286 successfully recanalized tubes were recanalized by liquid pressure method alone, accounting for 95.8% of the total; 12 tubes were recanalized by guidewire, accounting for 4.2% of the total. In 17 cases of dilated tubes with distal hydrocele, 9 cases were successfully recanalized and 8 cases were unsuccessful. 2. 96 cases were followed up from 6 to 9 months after the operation, 49 cases were conceived, the conception rate was 51%.