Six inbred lines of corn (Zea mays L.) were studied (S2 , ZP607 , HS ,
AGR183 , ZM7R and ZM19R( to attain hybridization program of Half – Diallel Cross. The research included 21 genotypes (6 parents + 15 hybrids) grown in fields of farmers field in AL- sofia area in east of Ramadi city in AL –anbar for spring season 2012 by using RCBD design with three replications , to study combining ability and heterosis for characters (number of days to female flowering ,plant hight, leaf earea, number of ear grains, weight of 300 grains and individual plant yield . Two parents (ZM19R and AGR183) showed good and desired general combining ability , whilethe hybrids (ZM19R×S2) , (ZM19R×AGR183) were showed high and good desired specific combining ability in most of the studied characters . The research showed that there were significantly differences at for all characters,also showed that the hybrids (ZM19R×S2) , (ZM19R×AGR183) showed desired heterosis for character plant yield and weight of 300 grains as compared with mid parents.