An experiment was conducted at the Experimental Farm of Rice Research Department at Sakha Agriculture Research Station, Field Crop Research Institute, ARC, Egypt, during 2015 and 2016 rice growing seasons to study the effect of GA  3 doses and row ratio of restorer Giza 178R and IR69625A cytoplasmic male sterile line (CMS) on different characters. Four levels of GA 3 doses, zero, 150, 200 and 250 g/ha and three row ratios 1R:10A, 2R:10A and 3R:10A for R and A lines respectively were used. The different doses of GA 3 showed highly significant influence on flag leaf angle(o), plant height, panicle exsertion, panicle length, seed set (%), panicle weight, number of panicles/plant ,grain yield, and harvest index when 3R:10Arow ratio and 250g/ha of GA 3 were used in the first and second seasons. The highest seed yield 2.5 t/ha was obtained when 250 g/ha of GA3 was applied with the row ratio of 3R:10A. The lowest seed yield (0.4 t/ha) was recorded without application of GA3 (control) and row ratio of 1R:10A.