大叶蝉亚科隶属于半翅目叶蝉科，是一类重要的或潜在的农林害虫，对其进行分类学和形态学的基础研究是一项长期的课题。传统的大叶蝉分类体系中，雄性外生殖器的研究及应用广泛，而雌性外生殖器的研究极少，以致其分类价值长期被忽略或严重低估。鉴于此，本项目拟对大叶蝉亚科昆虫雌性外生殖器进行系统的比较形态学研究，在全面记录大叶蝉亚科昆虫特别是中国种类的雌性外生殖器特征信息的基础上，比较研究不同种间、不同属间、不同族间的雌性外生殖器特征异同及变异程度，甄选出大叶蝉亚科有意义的雌性外生殖器分类特征，评价其在大叶蝉分类中的应用价值，建立大叶蝉亚科昆虫族、属、种各级的雌性外生殖器特征的结构模式和描述模式；基于雌性外生殖器反映出的信息，验证现有大叶蝉分类系统的合理性，综合考虑外部形态及雄性外生殖器特征，研究中国大叶蝉亚科属、种间的系统发育关系，提出更为合理的分类建议，完善大叶蝉分类系统。

The leafhopper subfamily Cicadellinae belongs to the family Cicadellidae of Hemiptera. Most genera of this potential economically important subfamily are still in need of taxonomic and morphological studies. The taxonomy of the subfamily is mainly based on characters of the male genitalia. However, the morphological diversity found in the female genitalia is still poorly known when compared to our current knowledge of the male genitalia, and the useful taxonomic features in the female genitalia are usually seriously neglected and underestimated by taxonomist. The aim of this project is to study comparative morphology of the female genitalia, and based on the detail descriptions of the female genitalia to provide comparisons of characters within different species, genera and tribes. The project would try to find useful taxonomic features in female genitalia and summarize the uniform structure pattern and taxonomic descriptions of female genitalia. Meanwhile, based on the information of female genitalia we obtained, the taxonomic system can be well reviewed. In addition, the character data of female genitalia would be used in combination with male genitalia and other external morphological features to build the phylogenetic relationships of Chinese species and improve the taxonomic system of this leafhopper subfamily.