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Tvvo line x 13 tester mating design along vvith 15 rice genotypes and their 26 F, s vvere used to study the heterosis as well as combining ability of yield and 7 yield contributing characters. Highly significant genotypic differences vºvere observed. The SCA variances vvere found highly significant vvhile GCA variances vºvere insignificant for all the characters. The highest heterosis (100.70%) was observed in cross IR62829A x IR44675R follovved by other 17 crosses for yield and most of its related traits. The contribution of testers was observed to be higher than that of the interactions of line x tester except panicle vveight that revealed the higher estimates of GCA variance le, additive gene action among the testers used. Except panicle vveight, mean performance of parents for all the traits vºvere strongly and positively correlated with GCA effects. Within CMS parents, IR62829A vvas found to be good general combiner …