Indications】 1.The fallopian tube is not patent or very poorly patent and requires treatment. 2.The fallopian tube is not visualized or partially visualized in HSG, to differentiate between spasm or high tension obstruction of the fallopian tube. 3. HSG shows obstruction of the proximal part of the fallopian tube, to differentiate between complete obstruction with adhesions or obstruction with loose adhesions or more secretions, which can be treated by recanalization. 5.During vaginal bleeding 6.After normal menstruation after curettage 【Patient preparation】 1.Select the 3rd to 7th day after menstruation, or postpone it if the menstrual cycle is long. 2. No history of sexual intercourse after menstruation and before imaging. 3. Negative test for trichomonas and mycobacteria in vagina (if positive, the test should be changed to negative three times after treatment) and cervical canal cleanliness PC within “+” (if “PC” ++, it should be rechecked after three days of vaginal medication as (If “PC” + +, it should be rechecked as “+/-” after three days of vaginal medication) before the imaging can be done. 4. For habitual abortion, if the cervical insufficiency is checked, the imaging should be performed only after three days of rising body temperature according to the basal body temperature table. 5. Pre-operative vaginal examination record of the month is required 6. Body temperature is measured on the day of surgery, if >37.5℃ cannot be contrasted 7. Urine evacuation before surgery