Hysterosalpingography is the gold standard for determining the patency of the fallopian tubes. It uses iodine contrast agent to enter the uterine cavity through the vagina and pass through the patient’s bilateral fallopian tubes to reach the pelvic cavity. At the same time, x-rays are used to take pictures, so it can objectively and clearly show the morphology of the uterine cavity, the patency of the fallopian tubes, the alignment of the fallopian tubes, the uplift of the fallopian tubes, and the diffusion of the contrast agent in the pelvic cavity. Therefore, through tubal imaging, it is possible to understand more clearly whether the uterine cavity is normal, whether the fallopian tubes are patent, whether there is inflammation in the pelvic cavity, and whether there are adhesions. In general, tubal imaging should be performed within 3-7 days after menstruation, and intercourse is not allowed before the test.