The present study was carried out at Sakha Agric. Research Station during 2011 growing season to study thegermination and early seedling growth and physiological attributes of five soybean (Glycine max L. Merr.) cultivars (Toano, Giza 35, Giza 111, Giza 22 and Giza 83, beside the five breeding lines H32, DR. 101, H9L186, H6L136 and H­2L78) under different levels of saline water. Two experiments were conducted first experiment on Petri dishes and the other in pots and saline water concentration, were 0, 6 ds/m 9 ds/m, 12 ds/m and 15 ds/m.  The obtained results proved that the genotypes under study could be arranged into three groups according to their sensitivity to salinitystress. The first group included the genotypes DR 101, Toano, H2L78, H9L86 and Giza 83, which are the most tolerant to salinity due to the high germinability and vigorous growth to development for whole plant under all levels of salinity. The second group included H32 and Giza 111 which are moderate tolerant. The third group include; H6L136, Giza 22 and Giza 35 genotypes as susceptible genotypes under different levels of salinity. Determination of ions showed that Na + concentration increased with increasing salinity level in all of genotypes. While the K + concentration was higher in salt stress tolerant soybean plants than the susceptible ones which decreased Na+ toxicity. It could be concluded that soybean genotypes Toano, Giza 83 and DR. 101 are salt stress tolerant due to their less Na + absorption and more Na + accumulation in root compared with other studied genotypes. The results indicated that under salt stress plant growth of cultivars Toano, Giza 83 and DR. 101 were better compared to the other soybean genotypes.