Abstract: The salt tolerance of 3 wild soybean(Glycine soja)populations was compared with their relative germination and seedling emergence. The results showed that the salt tolerance of Jiangsu wild soybean (JWS) was the strongest. Under NaCl stress,the dry matter accumulation in wild soybean seedlings decreased,root/shoot ratio increased,and these effects were greater in N₂3232 (salt sensitive) than in JWS (salt tolerant). Determinations on the ion contents in different organs indicated that the Na⁺ content was higher in stem than in other organs,and the accumulation of Na⁺ and Cl^- in roots was significantly more in JWSthan in N₂3232. The contents of these ions in JWSleaves were much less than those in N₂3232 leaves. There was no significant difference between selective absorptions of K⁺ and Na⁺ (AS K,Na) by the two populations,but the selective transportation of K⁺ and Na⁺ (TS K,Na) in stem and leaf was much higher in JWSthan in N₂3232,resulted in the higher K⁺/Na⁺ ratio in JWSshoots. It is suggested that the main reason for the salt tolerance in salt tolerant wild soybean was the accumulation of Na⁺ and Cl^- in roots and stems and the higher selective transportation of K⁺ from root to shoot.