The ultrasound probe is inserted into the vagina for about 10 cm, and the images of the uterus, ovaries and fallopian tubes can be clearly displayed. The fallopian tubes are located between the uterus and the ovaries and are tubular in shape, about 8-14 cm long, with intestinal distribution around the tubes and a certain curvature in their shape. The normal fallopian tubes are smooth in appearance and have no abnormal echogenicity inside. Common diseases of the fallopian tubes include inflammation, tubal cysts and hydrosalpinx. If the ultrasound shows thickening of the fallopian tubes with wall thickening and edema, it indicates inflammation. If the negative ultrasound shows smooth structures with a round envelope without echo in the tubal area, it indicates a tubal cyst. If the negative ultrasound shows fluid accumulation in the fallopian tube with irregular pattern and distribution along the fallopian tube, it indicates the presence of hydronephrosis. Other common diseases of the fallopian tubes include tubal obstruction, which cannot be detected by ultrasound and requires a tubal imaging test. The diagnosis rate of ectopic pregnancy by ultrasound is very high and is clearer than abdominal ultrasound.