Abstract： Some studies showed a mixed response of ground-dwelling beetle to forest regeneration and succession.In order to prove the change trend of beetle diversity following the gradient of succession and discuss the effect of environment factors on beetle community,a study of ground-dwelling beetle in three habitats along a succession gradient was carried out from June to August 2007 in the broad-leaved and Korean pine mixed forest in the Changbai Mountains,China using pitfall trapping.Total of 511 individuals and 23 species were identified.Carabidae and Silphidae were dominant families with maximum of species and individuals,respectively.The numbers of species and individuals in the secondary birch forest were greater than those in the secondary conifer and broad-leaved mixed forest and original broad-leaved and Korean pine forest.The investigation results suggested that the composition and diversity of ground-dwelling beetle was determined by succession stage.The beetle diversity in the secondary birch forest at the earlier succession stage was higher than that of climax forest community,but no significant differences in beetle diversity were showed among the three habitats.Highest numbers of beetle species and individuals were found in July.Species accumulation curves of all the three habitats did not reach an asymptote.The actual species richness values of the secondary conifer and broad-leaved mixed forest and original broad-leaved and Korean pine forest were both within the 95％ confidence intervals,but that of the secondary birch forest was lower than the minimum estimated value.There were no significant differences in beetle species-abundance distributions among the three habitats and all of them fit the log series distribution.The result of DCA showed that the dominance species of all sites was similar and the difference among habitats was made by occasional species.According to analysis of RDA,the area of breast height and soil moisture were main environment factors affecting distribution of ground-dwelling beetle,which explained 99.2％ of relationship between beetle and environment.