In order to explore the effect of inoculating plant growthpromoting rhizobacteria(PGPR)on the microenvironmental characteristics of the rhizosphere soil of Suaeda glauce Bge under different salt stress condition,a pot experiment including different salt stress gradient(light salt stress,moderate salt stress,severe salt stress)and corresponding inoculating PGPR was conducted to evaluate the effects of different treatments on root exudates,microbial populations,microbial diversity and root absorption area of Suaeda glauce Bge.The results indicated that the contents of organic acid and amino acid in the exudates,and microbial biomass carbon,microbial biomass nitrogen as well as total root absorption area had no significant differences with CK treatment,and the microorganism population,root volume and active absorption area under light salt stress conditions were significantly decreased,whereas the above indexes were all significantly decreased under moderate or severe salt stress conditions and the amplitude of reduction become larger along with the increase of degree of salt stress.After inoculating PGPR,the organic acid and amino acid contents in the exudates,and microbial biomass carbon and microbial biomass nitrogen contents as well as total absorption area and active absorption area of root system presented a trend of increasing,in which the above indexes achieved the maximum value by LS+P treatment and had significantly differences with the other treatments,showing 1457%,1280%,833% and 2824% increases in organic acid content,bacteria population,total absorption area and active absorption area of root system in comparison with CK treatment.Additionally,the microbial diversity index was the highest in LS+P treatment,followed by CK,light,moderate and severe salt stress,which had the same variation tendency as total microbial population.However,the microbial diversity indices and microbial population had different variation tendency between inoculating PGPR under moderate or severe salt stress and total microbial population.As a result,inoculating PGPR under light salt stress(salt content 100 g/kg)could significantly improve the microenvironmental characteristics of rhizosphere soil of Suaeda glauce Bge and the action effect was significantly higher than inoculating PGPR under moderate salt stress and severe salt stress.