Half diallel cross among ten pure lines of maize (ZM47R, CA21R, ZM49R, G17, nbreed12, ZM5i. Th97Alla-K122, G105, G54 and Th97A132-13-X14) was done, and then parents, their crosses and commercial variety Drachma were planted in 18 July 2013 at the instructional farm for development of cotton agriculture in Shirqat area, using R.C.B. Design with three replications, to assess the genetic of plant height, number of days to silking, number of ears per plant, ear diameter and length, number of grains per ear, 100-grain weight and grain yield per plant. General and specific combining abilities effects were estimated for parents and crosses respectively and gene actin controlled the inheritance of characters by Hayman approach (1954), also heterosis as compared with commercial variety Drachma estimated. The results of analysis of variance showed that mean square of general and specific combining ability was significant for all studied characters, indicating the presence of additive and dominance gene effects controlling the inheritance of these characters. The pure lines ZM47R, G17, ZM5i and G105 characterized by significant desirable general combining ability effects and high mean performance for most characters. The cross (CA21RxTh97Alla-K122) showed significant desirable specific combining ability effects for all characters, followed by crosses (G17xTh97A132-13-X14), (Inbreed12xG54) and (Th97Alla-K122xG105). The most crosses with desirable specific combining ability effect for grain yield per plant had significant heterosis as departure from commercial variety Drachma, and can take advantage of these crosses in the development of hybrid varieties of high productivity as well as to exploit the phenomenon of heterosis. Showed dominance component values more than her similitude for additive component. Narrow sense heritability values was within the medium range for all studied characters.