Vulvar intraepithelial neoplasia (VIN) is a relatively uncommon disease that includes all of the precancerous lesions of vulvar malignancies with an incidence of approximately 2.5 per 100 000 women.In 2004,the Intational Society for the Study of Vulvovaginal Diseases (ISSVD) abolished the old VIN grading system and introduced a two-tier classification for squamous VIN:the usual type and the differentiated type;the term VIN applied only to histologically high-grade squamous lesions (old terms VIN 2 and VIN 3).1 The two types of VIN differ in etiology,morphology,biology,clinical features and malignant potential.The usual type VIN (uVIN),which is associated with HPV infection,is the most coon subtype,accounting for more than 80％ of all VIN cases.Currently,the old 3-grade system of the VIN terminology is still used in most of the hospitals in China.In this presentation,we categorized the patients with the ISSVD 2004 classification standard and attempted to describe the clinical features and the outcome of surgical treatment of uVIN using the retrospective data from three academic hospitals in China.