Abstract: The relationship between 28 species water beetles in 12 lentic samples and environmental factors of North Changbai Mountain was studied by Cononical Correspondence Analysis (CCA).The results showed that degree of underwater humus and altitude are the major factors correlated with beetles distribution,and the correlation coefficients of envirommental factors and axes of CCAwere 0.8371 and 0.7206 respectively,while water temperature and plant density also had certain effects.Under the influence of environmental factors,the water beetles' populations were different in different habitat.Coelambus impressopunctatus,Colymbetes magnus,Helophorus browni,Haliplus spp.distributed in deep water pool.Water temperature was not important for those beetles.Ilybius sp.and Limnebius glabriventris correlated with altitude and humus.

Key words: Aquatic coleoptera, Environmental factors, CCA, plant community structure, alpine meadow, nitrogen addition, species composition, warming