Hysteroscopy is a new, minimally invasive obstetrical and gynecological treatment technique that can be used to diagnose, treat and follow up intrauterine cavity lesions. Hysteroscopy not only determines the site, size, appearance and scope of the lesion presence, but also allows detailed observation of the tissue structure on the surface of the lesion and sampling or positioning scraping under direct vision, greatly improving the accuracy of diagnosis of intrauterine cavity diseases, updating, developing and making up for the deficiencies of traditional treatment methods. Indications for hysteroscopic treatment: 1, frequent uterine bleeding, including excessive menstruation, frequent menstruation, prolonged menstruation, irregular uterine bleeding, etc. 2.For suspected endometrial cancer and its precancerous lesions, the application of hysteroscopy and localization biopsy combined with histopathological evaluation can help early diagnosis and timely treatment. 3.If there is abnormality or suspicion suggested by B-ultrasound, hysterosalpingogram or diagnostic scraping, the diagnosis can be confirmed, verified or excluded by hysteroscopy. 4. Those with intrauterine adhesions or foreign body residues in the uterine cavity. 5.Infertility and recurrent spontaneous abortion: on the basis of comprehensive and systematic evaluation of both men and women, the intrauterine cavity etiology will be explored and corrected.