High and stable yield is very desirable in barley  (Hordeum vulgare L.)  genotypes .The experiment of this study was  conducted in eighteen  environments (three locations , three K  rates and two seasons) . The three locations used are El-Serw , Noubaria and Hossienia all of them  have salty soils . Two season; 2009/ 2010 and 2010/2011 using  eight genotypes of barley.  The experiments  were grown in a  split-split blocks design with three replications in each location. The objectives of this study were to increase barley  productivity and adaptability under different conditions by identifying and developing genotypes that are more adapted and  more stable in  production under  these harsh environments. The combined analysis  of variance for environment (E), genotypes (G) and GE interaction  was  significant suggesting differential response of the genotypes and the need for stability analysis. The stability measures are useful in characterizing genotypes by showing their relation performance in various environments. Results revealed that high yielding cultivars  can also be stable cultivars. The genotype 4  followed by genotype 1 and genotype  2 were the most stable for grain yield because their regression coefficients were the highest, b_i value almost near unity and they had lower deviations from regression; these would be recommended for 18 environmental conditions.. These genotypes could be considered as  wide adaptive genotypes. The regression coefficient (b_i) and deviation of regression (S²_d) displayed highly significant positive correlation with phenotypic variance and coefficient of variation. In contrast, the insignificant correlation coefficients among the other stability parameters were found. Moreover, the mean grain yield displayed positive correlation with phenotypic variance  and regression coefficient, but there was negative correlation with coefficient of variation and deviation of regression.