Eighteen barley genotypes were evaluated for days to 50% heading, flag leaf area, plant height, 1000-grain weight, biological yield and grain yield under six varied environments which are the combination between, two seasons 2013/2014 and 2014/2015 and three water irrigation levels (800, 1100 and 1400 m3/fad.). The combined analyses of variance and the mean square of joint regression analysis of variance revealed significant differences among genotypes (G), environments (E) and the G x E interaction for all these traits. Environment + Genotype x Environment (E + G x E), mean squares due to environment (linear) and linear interaction (G x E linear) had highly significant effects for all characters. Severe and moderate water stress levels were significantly reduced all studied traits except 1000-grain weight for all barley genotypes than adequate water supply treatment. Grain yield reduced in the 1st year by an average of 25.67% and 13.44% and in the 2nd year by an average of 26.82% and 12.67% under 1st and 2nd irrigation levels, respectively, compared with the 3rd level. Phenotypic stability parameters showed that barely genotypes, Line 9, Rihane 3 and Line 11 was highly adapted to favorable environments for days to 50% heading; Line 6, Line 5 and Giza 2000 for plant height; Giza 126 for plant height, Line 1, Line 11and Rihane 3 for 1000-grain weight; Line 9, Line 7 and Line 2 for biological yield and Line 6, Line 9 and line 10 for grain yield. Genotypic stability parameters indicated that wheat genotypes Line 11 and Giza 2000 was highly adapted to favorable environments for days to 50% heading; Line 2 for plant height, 1000-grain weight and biological yield; Giza 123, Line 4, Line 6 and Line 7 for grain yield. The AMMI analysis of variance showed highly significant difference between genotypes, environments, G x E, IPCA1 and IPCA2. AMMI stability value (ASV) and GE biplot revealed that, the most desired and stable genotypes were Line 1, Giza 123, California mariout, Line 8 and Line 6 for grain yield. According to GGE biplots, the ideal genotype was Line 9 for days to 50% heading; Line 6 for plant height; line 11 for flag leaf area; line 1 for 1000-grain weight; Line 9 for biological yield and Line 6 for grain yield. Keywords: Barley, genotype x environment, phenotypic and genotypic stability, AMMI, water stress