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In order to recognition of salt tolerant genotypes and concerned mechanisms to them in soybean (Glycine max), 12 genotypes of soybean germplasm belong to oil seed researchment department evaluated for traits: dry biomass weight, survival biomass, dry root weight, leaf area, plant height, number of nods, and quantity factor including: leaf chlorophyll content, Relative water content, membrane stability, Na+ , K+, K+ / Na+ values under three treatment levels including : check (normal), 80 mM salinity and 160 mM salinity with three replication. result of study showed genotypes: GN 1096, GN 2131 and GN 3008 were tolerant in both of moderate and severity salinity stress levels and genotypes: GN 1169 and GN 2151 only were tolerant in severity and moderately level respectively and the mechanisms: selective ions entrance, adverse ions exclusive by falling older leaves and storing ions in organ such as vacuoles recognized as persist manners under salinity in the studied genotypes