Pelvic fluid is clinically caused by the following reasons: 1, physiological fluid, mainly caused by intestinal lubricating fluid or follicular fluid, often without any symptoms, can be self-absorbed, so clinical treatment is not necessary. 2, due to chronic pelvic inflammation, due to inflammation leads to the local tissue exudate, so the formation of effusion, the depth of this effusion by ultrasound is often greater than 2cm. 3, due to ectopic pregnancy or ovarian luteal rupture caused by effusion, this often causes acute lower abdominal pain and bleeding can be combined with the clinical history, the patient will soon be in a state of shock. Ectopic pregnancy or ovarian corpus luteum rupture caused by the effusion, this effusion will often cause acute lower abdominal pain, and bleeding, the patient will soon go into shock, can be combined with the clinical history, if necessary, do the posterior fornix puncture to determine the nature of the effusion, and then decide whether to need surgery for treatment.