The fourth fillial generation with their parents p1 and p2 for four crosses in six row barley (Hordium vulgare L.): Jezera1 x Badya, Tadmer x Arivat, Rehan x Bendict and Rum x Forest. The seeds were planted in 2007 using R.C.B.D. with four replications. The data were recorded for the traits; maturity time, number of spikes, spike length, grain yield, weight of 1000 grains and number of grains per spike, to estimate average degree of dominance, heritability and expected genetic advance from selection.. The results showed that over dominance were presence for the studied traits. The values of broad sense heritability were high for the studied traits in the all crosses. The values of narrow sense heritability were (1) high for number of spikes in the all crosses, maturity time, grain yield and spike length in the second and fourth crosses and weight of 1000 grains in the second cross(2) low for the weight of 1000 grains and number of grains per spike in the fourth cross.(3) moderately for the other traits. The results of this study indicated that selection will be effective to obtain superior strains in the four crosses for the studied traits except spike length and weight of 1000 grains in the second cross. Therefore recurrent selection will be suggested to increase the desirable genes.