襀翅目真颚组昆虫生活在多种水域中，对水质敏感，可作为水资源污染监测的指示生物，开展该类昆虫的分类及系统演化研究具有重要的实际意义和科学价值。本研究目的在于查清我国襀翅目真颚组的种类组成，分析其区系特点，建立一批新的分类单元，考订早期发表的属种。通过成虫比较形态学研究，规范简明属种特征；结合稚虫形态、卵的超微结构和分子特征(mtDNA全基因组、18S rDNA、histone 3基因等)，应用支序分析法，研究该类群的系统发育关系，修订和完善其分类系统。在系统发育研究基础上，利用分子钟计算主要支系的分歧时间；结合化石资料和地理分布信息，应用分支生物地理学方法，解析襀翅目真鄂组各科、属的分布格局、间断分布格局的形成机制及起源演化过程。这些研究成果将为世界襀翅目的地理分布、起源、演化和襀翅目高级阶元及六足总纲的系统发育研究提供重要的基础材料；也为中国动物地理区系和系统进化动物学的研究提供理论依据。

The insects of Euholognatha in Plecoptera live in a variety of the water and can be used as indicative organism for monitoring water pollution due to more sensitive to the water pollution. There will be very important practical significance and scientific value if carrying out researches on systematics, phylogeny and evolution of this group. This program aims to study the species composition and the characteristics of the fauna of Euholognatha in China, establish the new taxa, revise early published species and set up the characteristic pattern of species and genera of this group based on the comparative morphology of the adults. Based on the morphology of adults and nymphs, the ultrastructure of the eggs and the molecular characteristics (complete mitogenome, 18S rDNA, histone 3 gene etc), the phylogenetic relationships of Euholognatha will be set up by the method of cladistic analysis, and the classified system of this group will be revised and perfected. Based on the phylogenetic relationships of Euholognatha, the diverging time of the main clade of the cladogram will be calculated by the method of molecular clock. And combining the information of the fossil and the geographic distribution of this group, distribution patterns, formative mechanism of the discontinuous distribution pattern, origin and evolution of the families and the genus in this group will be analyzed by the method of the cladistic biogeography. These results not only provide important materials of the geographical distribution, origin, evolution of Plecoptera and the Hexapoda phylogeny, but also provide theoretical basis for Chinese fauna and systematic evolutive zoology.