NOVELTY - Method for improving the adaptive capacity of soybeans in saline-alkali soil, involves inoculating nodule bacteria in trypton-yeast(TY)-calcium ion (Ca2+) medium, incubating to obtain a mother liquor, inoculating mother liquor in TY/Ca2+ medium, incubating to obtain nodule bacteria fluid, mixing nutrient soil and perlite uniformly to obtain bacterial manure matrixes, mixing the nodule bacteria fluid and bacterial manure matrixes to obtain nodule bacteria manure, and transplanting soybean seedlings into the nodule bacteria manure and cultivating the seedlings.    USE - The method is useful for improving the adaptive capacity of soybeans in saline-alkali soil and salt tolerance related-gene expression level of the soybeans.    ADVANTAGE - The method utilizes the nodule bacteria manure to promote the whole plant fresh weight of the soybeans to be increased by 22.50-125% in the soil with high-concentration salt, and improves the mRNA expression level of peroxidases, preferably ascorbate peroxidases and superoxide dismutase by 3-8 times.    DETAILED DESCRIPTION - Method for improving the adaptive capacity of soybeans in saline-alkali soil, involves (a) inoculating nodule bacteria in trypton-yeast(TY)-calcium ion (Ca2+) medium, and incubating at 28-30 degrees C under condition of shaking at 225 revolutions/minute (rpm) for 8-12 hours to obtain a mother liquor, where the TY/Ca2+ medium (pH 7.1-7.3) comprises 4.9-5.1 g/l tryptone, 2.9-3.1 g/l yeast extract, 5-7 mmol/l calcium chloride, and solvent, preferably water, (b) inoculating 0.1-0.5% mother liquor in TY/Ca2+ medium, and incubating at 20-30 degrees C under condition of shaking at 200-225 rpm until optical density (OD)600 value reaches 1-1.2 to obtain nodule bacteria fluid, (c) mixing nutrient soil and perlite uniformly in a ratio of 1:2.5-3.5 to obtain bacterial manure matrixes, diluting the nodule bacteria fluid using purified water until OD 600 reaches 0.001-0.005, mixing the diluted nodule bacteria fluid and the bacterial manure matrixes in a ratio of 1:4-5, stirring uniformly to obtain nodule bacteria manure, and (d) transplanting soybean seedlings into the nodule bacteria manure and cultivating under the condition at 23-27 degrees C and illumination intensity of 2000-2500 lx for 12 hours/day.