Nineteen yellow maize (zea mays L.) inbred lines were top crossed with two inbred lines testers; GZ 658 and SD 3120 in season 2015. In 2016 summer season, these 38 crosses were evaluated in a randomized complete blocks designs experiment with four replications at two locations; Sakha and Sids, Agriculture Research Center, Egypt. Locations mean square were highly significant for all traits. Mean squares of crosses and their partitions (lines, testers and lines x testers) showed highly significant for all traits under this study except, testers mean square for ear height and ear diameter and lines x testers for ear height and ear length. The additive and additive x additive gene actions played more important in the inheritance traits; days to 50% silking, ear length, ear diameter and grain yield, while, the non- additive gene actions in the inheritance traits pant and ear height.The inbred lines (L₁, L₇ and L₁₄) and the tester GZ 658had desirable positive and significant (g^{^}_i) for grain yield (ard/ fad) (ardab (ard) =140 kg, faddan (fad) = 4200 m²). Five crosses:  L₁ x Gz 658 (35.86 ard/ fad), L₂ x Gz 658(34.86 ard/ fad), L₇ x Sd 3120 (35.66 ard/ fad), L₁₄ x Gz 658 (35.20 ard/ fad) and L₁₅ x Gz 658 (34.79 ard/ fad) had highly significant for grain yield (ard/ fad) more than the highest check Sc 168 (30.13 ard/ fad).