Colposcopy is recommended for women of childbearing age on 3-7 days after menstruation, when there is relatively little discharge and the field of vision is clearer. If there is acute inflammation, colposcopy should not be done, and if there is a pathogenic infection in the routine leucorrhoea test, colposcopy should not be done. If there are no contraindications, the patient can empty the bladder and then take the cystotomy position on the examination bed, disinfect the vulva and vagina, and then perform colposcopy. Colposcopy is a local magnification of the cervix to see if there are any abnormalities in the epithelium or blood vessels of the cervix and to make the appropriate diagnosis. The surface of the cervix is then coated with acetic acid to see if there is a thick white acetate epithelium, which is often a sign of a lesion. After applying the acetic acid epithelium, it is observed whether there are heterogeneous blood vessels, and then iodine is applied clinically to find out whether mustard yellow appears, and if there is mustard yellow, a biopsy is taken from the mustard yellow area and sent for pathological examination, and then gauze is inserted in the vagina and colposcopy is completed.