Investigation was carried out to determine gene action and combining ability studies in rice. The material consisted of F₁ population of 30 crosses developed by crossing 10 genotypes with three testers. TDominance genetic variance were highly significant as compared to additive gene effects for total tillers plant^-1, effective tillers plant^-1, spikelets panicle-1, grains panicle^-1, grain fertility, biological yield plant-1, harvest index, grain yield plant-1, 1000-grain weight and grain length and L:B ratio. The average degree of dominance was observed more than one for all the traits studied except plant height, panicle length, days to 50% flowering and days to maturity. The cross HPR 2639 x HPR 2143 is a good specific combination for grain yield plant^-1, panicle length, spikelets panicle^-1, grains panicle^-1, biological yield plant^-1, days to 50% flowering and plant height.