溪泥甲科是一类小型水生的鞘翅目昆虫，迁徙能力弱、对水质变化敏感，是水质监测的理想指示物。溪泥甲科昆虫种类丰富，主要分布于东洋界、古北界。近些年，一系列分类修订工作已经极大提高了人们对于溪泥甲科的认识；但是溪泥甲科内部的系统发育关系仍十分混乱，存在属间亲缘关系不清，一些疑难属、种的分类地位不清晰等问题。 新属、种的发现速度越来越快，为了避免新的分类学问题发生，亟待开展溪泥甲科的系统发育研究。本项目以我国溪泥甲科昆虫为研究对象，采用分子生物学手段与经典分类学方法相结合，基于分子数据和形态性状对我国溪泥甲科昆虫的系统发育关系进行深入研究。研究结果将首次提出我国溪泥甲科系统发育假设，解决我国溪泥甲科中存在的分类学问题，修订溪泥甲科分类系统。

Elmidae, commonly known as raffle beetles, are smaller-sized aquatic beetles in Coleoptera. They are very sensitive to water quality with great value as bio-indicators. They are mainly distributed in Oriental and Palearctic regions. In recent years, a series of revisionary works has dramatically improved our understanding of species diversity in the family Elmidae. However, most genera in Elmidae remain poorly characterized and phylogenetic relationships within the family are unexplored. As the rate of species discovery accelerates, there is a need to better define genera characterists in order to avoid arising newly taxonomic problems. Here we select Elmidae of China as the study object, combined molecular techniques with classical taxonomic methods, based on a combination of molecular and morphological data to study the phylogenetic relationships of Elmidae beetles. The results will first present the phylogenetic relationships of Elmidae, to solve the taxonomic problems of the Elmidae, and to revise the classification system of ELmidae beetles in China.