In this study the inheritance of important quantitative traits has been studied through a complete diallel cross (8×8) and generation mean analyzing design (two crosses) to choose an efficient breeding method for the improvement of these traits in doubled haploid bread wheat. The analyses of gene actions indicated that a large part of the total genetic variation observed for number of spikelets per spike, number of tillers and grain yield per plant was in the form of dominance genetic effects. In addition, duplicate type of epistasis observed in the expression of these traits. Thus, bi-parental mating, or diallel selective mating could prove a worthwhile approach for further improvement of these traits. Instead, dominance was partial and narrow sense heritability estimate for number of grains per spike and plant height was high, indicating the preponderance of the additive effects. To conclude, in order to improve these traits, selection in early generation is possible. In addition, in populations under study, these traits can be suitable indices for grain yield indirect selection.