Abstract: 【Objective】 Evaluation of the effect of composite bacteria on the functional diversity of microorganisms in wheat rhizosphere soils based on principal component-membership function analysis. 【Methods】 This study used a pot experiment to investigate the effects of Halomonas L6, Paenibacillus Y24 and compound bacteria L6-Y24 on rhizosphere soil physicochemical properties and microbial functional diversity of wheat in arid areas of Xinjiang. 【Results】 Compared with the control treatment, soaking seeds in L6, Y24, and L6-Y24 hadn't significant impacts on soil electricity conductivity and pH value, but soil available potassium content significantly increased by 29.17%, 47.02%, 33.93%(P<0.05), and available nitrogen content of L6-Y24 significantly increased by 21.43%(P<0.05). Studies of Biolog microbial functional diversity showed that the average absorbance values of L6, Y24 and L6-Y24 had significantly increased by 60.04%, 74.82% and 165.32%(P<0.05), respectively. The Shannon richness index of L6-Y24 had significantly increased by 15.83%. The utilization of carbohydrates, amino acids, carboxylic acids, phenolic acids, polymers and amine carbon sources by composite bacterial soaking significantly increased by 103.60%, 203.72%, 208.33%, 684.09%, 364.10% and 100.29%(P<0.05), respectively. Differentiated functional diversities of the soil microbial communities by functional strains and their complex bacteria were carbohydrates and carboxylic acids. Close relationship among the rhizosphere soil physicochemical properties and microbial function diversities in wheat soaked with growth promoting bacteria. 【Conclusion】 The composite bacteria has the best promoting effects on physicochemical properties and microbial function diversities of wheat rhizosphere soil, and can alleviate the damage caused by abiotic stresses such as salt alkali and drought.