Watery leucorrhea may be caused by the following reasons: i. The most common one is caused by bacterial vaginosis, mainly after Gardnerella infection, there will be very thin vaginal discharge, but this discharge will have a great odor, and after laboratory tests, Gardnerella can be found. Second, watery leucorrhea is also seen in cervical cancer or endometrial cancer or fallopian tube cancer, so detailed examination must be done when leucorrhea appears watery. It is recommended to do clinical screening for cervical cancer and then ultrasound to understand the thickness of the endometrium and whether the echo is uniform; check whether there is fluid in the fallopian tubes and whether there are abnormal echoes, and then give clinical treatment according to the results.