Pus and blood leucorrhea is the leucorrhea with blood, which is a manifestation symptom of inflammatory manifestation of leucorrhea abnormalities and is a signal of female internal genital diseases, which should be taken seriously. Routine examination of leukorrhea can confirm the diagnosis. Cervical cancer, endometrial cancer, cervical polyp or submucosal myoma should be considered. The placement of intrauterine device can also cause bloody leucorrhea. Diagnostic basis of purulent leucorrhea caused by cervical cancer: 1. Cervical scraping Cytological examination is the main method to detect precancerous lesions of the cervix and early cervical cancer. Since the cervix is exposed at the top of the vagina, it is easy to observe and take materials, so at present, cervical cytology scraping is routinely performed as a screening tool for all married women during gynecological examination or cancer prevention screening. Therefore, the positive rate of early cervical cancer diagnosis is greatly improved, reaching over 90%. 2.Iodine test Normal cervical or vaginal squamous epithelium is rich in glycogen and can be dyed brown by iodine solution, while cervical canal columnar epithelium, cervical erosion and abnormal squamous epithelial area (including squamous epithelial hyperplasia, atypical hyperplasia, carcinoma in situ and infiltrative carcinoma area) do not have glycogen, so they are not colored. Clinically, after exposing the cervix with a vaginal speculum, the surface mucus is wiped off and 2% iodine solution is applied directly on the cervix and vaginal mucosa, and the area without coloring is positive. 3.Cervical and cervical canal biopsy All clinical examinations of the cervix are important parts of diagnosis, but biopsy is the most reliable basis to diagnose cervical cancer. If the cytological examination of cervical scraping is above grade III-IV smear, but the cervical biopsy is negative, four biopsies should be taken at points 6, 9, 12 and 3 of the squamous junction of the cervix, or multiple tissues should be taken in the area not colored by iodine test and the suspected cancerous area and sectioned, or a small scraper should be used to scratch the cervical canal and send the scrapings to pathological examination. 4.Colposcopy Colposcopy cannot diagnose cancer directly, but it can help to select the site for cervical biopsy. According to statistics, if biopsy can be taken with the assistance of colposcopy, the diagnostic accuracy of early cervical cancer can reach about 98%. Vaginal microscopy can magnify 100-300 times, and the cervix is coated with 1% toluidine blue staining, which can observe the cell structure and classify and diagnose according to the morphology, arrangement, size and nuclear size, morphology, coloring depth and capillary image of the cells. However, colposcopy cannot replace scraping cytology and biopsy because it cannot detect lesions in the squamocolumnar junction or extended cervical canal. 5.Conical hysterectomy When biopsy is not sure whether there is invasive cancer or not, conical hysterectomy can be performed. When cervical cell scraping examination is positive for many times, while multi-point biopsy and cervical canal scraping are negative, or it has been proved to be carcinoma in situ and cannot exclude invasive carcinoma, cervical conization can be performed and sent to pathology. Because there are different degrees of complications after conization, it is not used in clinical practice at present, and can be replaced by total hysterectomy if it is used as a treatment procedure. 6.Cervical photography Using a 10mm microscope attached to a 35mm camera and 50mm extension circle to form a photographic instrument, the images obtained are projected on a 3.3m wide screen and observed at a distance of 1m; all the squamocolumnar junction is shown, no abnormality is negative, abnormality is found to be suspicious, and no squamocolumnar junction is not seen to be unsatisfactory. It is observed that its diagnostic accuracy is 93.1%, so it is a new method with high accuracy, low cost and easy application. 7.Fluoroscopy method uses the mechanism that cancer tissue and normal tissue absorb different amounts of fluorescein and show different colors to diagnose whether there is cancer or not. Cancer tissues absorb more fluorescein and the fluorescence produced is stronger than normal tissues and is dark yellow, while normal tissues are purple-blue. 8.Tumor biochemical diagnosis Through clinical research, scholars found that lactate dehydrogenase and glucokinase are significantly increased in cervical cancer patients, especially in those with infiltration, which is helpful for clinical diagnosis.