The degree of endometrial recovery after hysteroscopic surgery is determined by gynecological vaginal ultrasound, uterine 3D ultrasound or repeat hysteroscopy to see the status of the endometrium. Hysteroscopic surgery is mainly used to treat endometrial polyps, endometrial thickening, endometrial thinning, post-abortion adhesions and other endometrial related diseases. All of these endometrial pathologies are primarily corrected by hysteroscopic surgery. After hysteroscopic surgery, endometrial recovery can be observed by repeat gynecologic vaginal ultrasound, uterine 3-D ultrasound, or repeat hysteroscopy. Routine gynecologic vaginal ultrasound can look for the presence of endometrial polyps. The thickness and shape of the lining of the uterus under the ultrasound is used to determine if it is too thin or thickened. The normal gynecological vaginal ultrasound to see the uterine cavity adhesion is slightly more difficult, can be changed to the uterine cavity three-dimensional ultrasound to determine more accurately, in the difficult to distinguish, can also be reviewed hysteroscopy. The specific use of which method of judgment should be carried out under the guidance of the doctor.