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The effects of water stress on the morphological and quantitative traits of mung bean were studied by planting 600 ecotypes in two separate augmented designs in normal and stress conditions. Comparision of traits in both conditions showed that water stress negatively affected plant growth. The stress condition had the highest effect on plant hight and the least on 100-seed weight ,harvest index, and pod length. Comparison of different water stress indices showed that Stress Tolerance Index , Mean Productivity , and Geometric Mean Productivity were the best indices that can be used to determine resistant genotypes. Based on these indices 1,17,170 and 394 genotypes were recognized as the highest yielding genotypes under both stress and non - stress conditions . Results of by - plot analysis, similarly, identified the same genotypes as highest yielding once in both conditions .