Tubal obstruction is a common cause of female infertility, accounting for about 1/3 of female infertility. Selective tubal imaging and recanalization has definite curative effect on tubal obstruction infertility, which helps to diagnose the location, degree and nature of fallopian tubes, and can make the blocked tubes to be recanalized. According to statistics, the rate of recanalization is about 97% and the rate of conception is about 47%. The operation is simple, safe, no incision, less pain to the patient, fewer complications, is the first choice of diagnosis and treatment of tubal obstruction infertility. 1.Uterine Tubal DSA: Uterine and tubal imaging is performed under DSA (Digital Subtraction Angiography) machine, which has the advantages of clear image, less side effects, high success rate of imaging and high diagnostic accuracy. Compared with the traditional X-ray machine, it greatly improves the clarity of the image, and can get continuous and complete dynamic image of the whole fallopian tube, which can be observed from multiple angles; Since the DSA machine is specially developed for interventional therapy, it adopts many devices to reduce the X-ray radiation, which can reduce the amount of rays by about 70%, and greatly reduces the radiation damage to the uterus and ovaries. Through the contrast catheter drug infusion on the uterus, fallopian tubes and even pelvic inflammation, adhesion has a definite curative effect. 2.Tubal Intervention Therapy: It integrates diagnosis and treatment in one time, the soft guide wire catheter acts directly on the obstruction point, and carries out local imaging and liquid circulation, which can not only clarify the obstruction site, but also separate the adhesion and obstruction of fallopian tube with the help of local flushing medication and expansion of the guide wire, together with the push and support of liquid hydrostatic pressure, which can make the tubes re-circulate and be consolidated. The indications for uterine tube DSA and tubal intervention are: ①, suspected or diagnosed tubal obstruction of all sections of selective tubal imaging, fluid circulation; ②, tubal laparoscopic surgery and open surgery preoperative diagnostic needs; ③, interstitial to juxtapical obstruction of tubal recanalization; ④, conventional uterine tubal imaging can not be completed because of the cervical opening is too loose. 3, preoperative preparation: no hospitalization, choose 3-7 days after menstruation, can not coitus, vaginal cleanliness, no acute inflammation of the reproductive tract, no history of iodine allergy; check the leukorrhea routine, blood routine, bleeding and clotting time.