020202 Vaginitis is a common gynecological disease caused by pathogenic bacteria in clinical practice. Depending on the type of pathogen, the clinical typical is divided into the following three categories: bacterial vaginitis, fungal vaginitis, and trichomoniasis vaginitis. The diagnostic criteria for each type of etiology are: [bacterial vaginosis] Find clue cells under the microscope. [Fungal vaginitis] Find mycelium or spores under the microscope. [Trichomonas vaginitis] Trichomonas vaginalis was found under a microscope. [Bacterial vaginitis] In the guidelines for the diagnosis and treatment of bacterial vaginosis (BV) in China, the United States, and Canada, it is stated that clinical diagnostic standards and etiological diagnostic criteria can be used. Currently, the diagnostic standard for bacterial vaginosis (BV) is the AMSEL method proposed in 1983. There are four clinical standards, of which three or more positive can determine BV positive. 1. The lead cell is positive. 2. Amine test positive 3, vaginal PH value>4.54, homogeneous thin vaginal discharge ★ The Chinese guidelines point out that the first “clue cell positive” diagnosis is essential.