Abstract: Taking the saline-alkali-tolerant common bean variety ‘HYD’ and the saline-alkali-sensitive common bean variety ‘JW’ as test materials,potted plants were used.Two basic salts of Na₂CO₃ and NaHCO₃ were mixed to simulate the saline-alkali habitat at a molar ratio of 1:9.According to the mass percentage in the soil after mixing,0%（T0）,0.1%（T1）,0.2%（T2）,0.3%（T3）,0.4%（T4）,0.5%（T5）,0.6%（T6） concentration seven gradients were designed to explore the effects of different saline-alkali concentration treatments on the growth of common bean seedlings and the chemical properties of rhizosphere soil.In order to provide a reference for the screening of salt-tolerant common bean varieties.The results showed that the plant height,stem thickness and freshness and dry weight of individual plant aboveground,root length,root surface area and root volume of the two common bean varieties showed a trend of first increasing and then decreasing with the increase of saline-alkali concentration.The highest value was reached under T1,the plant height of variety ‘HYD’ increased by 7.33% compared with the control,the root volume of variety ‘JW’ increased by 36.05% compared with the control,and the response of variety ‘HYD’ to changes of different saline-alkali stress concentrations was more obvious than that of ‘JW’.Both soil pH and electrical conductivity showed a gradual increase trend with the increase of saline-alkali concentration.The contents of rhizosphere soil organic matter,available nitrogen,available phosphorus and available potassium of ‘HYD’ and ‘JW’ all showed a trend of first increasing and then decreasing.Among them,it was significantly reduced under T6,the content of available phosphorus in variety ‘HYD’ was reduced by 14.30% compared with the control,and the content of available potassium in variety ‘JW’ was significantly reduced by 17.98% compared with the control.In addition,‘HYD’ varieties were higher than ‘JW’ under the treatments of various saline-alkali concentrations,showing strong adaptability to saline-alkali stress.Comprehensive analysis showed that through the accumulation and restriction of Na⁺,the roots of common bean seedlings increase the content of mineral ions in the soil and increase the absorption of effective nutrients by plants to adapt to saline-alkali stress.Therefore,the growth of common bean seedlings and the chemical properties of the rhizosphere soil both present low concentrations of salt.The alkali stress treatment promoted to a certain extent,and the high concentration saline alkali stress treatment showed inhibition.