【Objective】 It is of great significance to vegetation restoration in and eco-remediation of saline-alkali soils to unfold researches on microbial community diversity in the rhizospheres of salt-tolerant plants in saline-alkali soils. 【Method】In this research, the biolog ecoplate technology was used to study soil enzyme activities and metabolic function diversity of the microbial communities in the rhizospheres of six salt-tolerant species of plants species in saline-alkali soils North Yinchuan. 【Result】Results showed physical and chemical properties and enzyme activity of the rhizosphere varied somewhat with species of the plant. Compared with bare soil, rhizosphere soils of the salt-tolerant plants were significantly higher in soil enzyme activity, especially the rhizosphere soil of Medicago sativa in the activity of three kinds of soil enzymes. In general, the average well color development (AWCD) of the rhizosphere soils increased with the processing of culture and in terms of AWCD, the five species of plants followed an order of Medicago sativa (MX), Achnatherum splendens (JJC), Tamarix chinensis (CL), Panicum virgatum (LZJ), Sophora alopecuroides (KDZ), Lycium barbarum (GQ), all being much higher than that in the bare soil (CK) (P <0.05). The soil microbial community in the rhizosphere soil of Medicago sativa was the highest in Simpson index, Shannon index and McIntosh index, and followed by that of Achnatherum splendens, and the two differed significantly from that of the others (P <0.05). Soil microbial community in the rhizosphere soil varied with species of the plant in ability to utilize carbon resources. The one in the rhizosphere soil of Medicago sativa was significantly higher than that of the others in carbon utilization ability (P <0.05). Carbohydrates were the main carbon source for soil microbes in rhizosphere soil, and followed by amino acids and carboxylic acids, and amines the last. Principal component analysis demonstrates that the main carbon sources that differentiated between PC1 and PC2 were carbohydrates and carboxylic acids. 【Conclusion】All the findings demonstrate that all the indices are higher in the rhizosphere soil than in the bulk soil or soil of the bare saline-alkali field, particularly in the Medicago sativa and Achnatherum splendens fields, which demonstrates that the plants significantly improve functional diversity of the soil microbial community, thus contributing positively to nutrient recycling in the rhizosphere micro-environment in saline-alkali lands.