Field experiment was carried out at the Experimental Farm of Rice Research and TrainingCenter,(RRTC), Sakha, Kafr EL-Sheikh, Egypt during 2010 and  2011 summer seasons. In order to estimate general combining ability (GCA) and specific combining ability (SCA) effects of the parents and their F₁ for some agronomic and yield and its component traits. This study involving ten rice genotypes, i.e. three commercial varieties (Giza178, Sakha103 and Sakha106), one promising line Gz 9057-6-1-3-2 (Giza179) and six Egypt ∕ America bold grains genotypes (SKC 23819-189-1-1-1-3-1-2-4-2, SKC 23819-192-2-1-2-2-4-2-1-2, SKC 23819-192-2-1-2-3-1-1-1-2, SKC 23819-192-2-1-2-4-5-3-2-1, SKC 23819-192-2-2-1-1-2-1-2-2 and SKC 23819-192-2-2-1-1-2-2-1-2. The parental genotypes have a wide range of variations for all studied traits, origin, pedigree and group type. Ten parental genotypes in this study were sown in three sowing dates. A line x tester cross was conducted among the ten parents (four lines and six testers) in (2010) to produce (24) crosses. The parental genotypes and their 24 crosses were studied for eight traits i.e. No of days to heading (day), plant height (cm), number of tillers plant^-1, flag leaf area (cm²), grain yield plant^-1 (g), number of panicles plant^-1, 1000-grain weight (g), and number of filled grains panicle^-1 the mean square of parents, crosses and parents vs. crosses revealed highly significant variations for all traits under investigation. GCA were found to be highly significant for all studied traits, except grain yield plant^-1 and 1000-grain weight for Sakha 103 and grain yield plant^-1 for line (Gz 9057-6-1-3-2) which was found to be not significant while testers, namely SKC 23819-189-1-1-1-3-1-2-4-2, SKC 23819-192-2-1-2-3-1-1-1-2 and SKC 23819-192-2-2-1-1-2-1-2-2 were also not significant for grain yield plant^-1. Sakha 103 and Sakha 106 were good combiners for early maturing. Regarding to number of tillers plant^-1, flag leaf area (cm²), number of panicle plant^-1 and number of filled grains panicle^-1, the parental variety, Gz 9057-6-1-3-2 exhibited highly significant positive GCA effects for these traits. The rice variety Sakha 106 was found to be highly significant positive GCA effects for 1000-grain weight and grain yield plant^-1. While, SKC 23819-192-2-2-1-1-2-1-2-2 proved to be excellent combiner for 1000-grain weight, while SKC 23819-192-2-2-1-1-2-2-1-2 was the best combiner also for the grain yield plant^-1 this traits would be of practical interest in breeding program towards developing high yielding genotypes. Three out of the twenty four rice hybrid combinations showed highly significant positive SCA effects for grain yield plant^-1, 1000-grain weight and number of filled grains panicle^-1, this combinations, were Sakha 103 x SKC 23819-192-2-1-2-2-4-2-1-2, Giza 178 x SKC 23819-189-1-1-1-3-1-2-4-2 and Giza 179 x SKC 23819-192-2-1-2-3-1-1-1-2.