Root microbiota,originating from soil microorganisms,significantly impacts plant growth,development,adaptability,and invasiveness. However,the characteristics of root endophytic bacterial communities in native and exotic legumes remain poorly understood. In this study,combing with high-throughput sequencing technology alongside controlled indoor cultivation methods,we examined the root endophytic bacterial community characteristics of native Albizia kalkora and exotic Leucaena leucocephala in a dry,hot valley. The results showed that: (1) Throughout cultivating period,L. leucocephala exhibited significantly greater plant height and litter biomass compared to A. kalkora,and the leaf N ∶ P ratio,nodule number and nodule weight of L. leucocephala were also significantly higher than those of A. kalkora after 80 days. (2) There were significant differences in the composition of root bacterial community between A. kalkora and L. leucocephala. At the phylum level,the most dominant phylum was Proteobacteria,and the relative abundance of Firmicutes and Patescibacteria in the roots of A. kalkora was significantly higher than that of L. leucocephala,while the relative abundance of Bacteroidetes and Actinobacteria was significantly lower than that of L. leucocephala. At the genus level,L. leucocephala's roots had a significantly higher relative abundance of Mesorhizobium,Pseudolabrys,and Streptomyces compared to A. kalkora,yet significantly lower relative abundances of Bradyrhizobium,Paenibacillus,Novosphingobium,Aquicella,and Saccharimonadaceae. (3) Plant,culture time and their interaction had no significant effects on the α diversity indices of root bacterial communities,and the indices of Chao 1,Pielou e,Shannon and Simpson of root bacteria between A. kalkora and L. leucocephala were not significant different. (4) Metabolism was the most important function within the root bacterial community,constituting approximately 80% of the relative abundance. After 80 days,significant differences in cell growth and death,membrane transport,carbohydrate metabolism,metabolism of terpenoids and polyketides were found between A. kalkora and L. leucocephala. In conclusion,there are significant differences in the growth traits and root bacterial community between A. kalkora and L. leucocephala,and the possible effects of these differences should be considered in the process of vegetation restoration in future.