The main objective of this study was to study the genetic behavior for some Japonica rice varieties in Egypt. An experiment was conducted to evaluate the performance of 15 F₁ hybrids along with their parents i.e Giza177; Sakha101; China2; IR67701B; GZ8479-6-2-3-1 and GZ7955-13-2-1-1 in rice by using a half diallel analysis mating design at Rice Research and Training Center (RRTC) Farm, Sakha, Kafr El-Sheikh, Egypt during 2010 and 2011 growing seasons. Analysis of variance revealed highly significant differences among genotypes; parents and crosses for days to maturity (days); plant height (cm); panicle length (cm); spikelets panicle^-1; panicles plant^-1; panicle weight (g); 1000-grain weight (g); spikelets fertility% and grain yield plant^-1 (g). Both general and specific combining ability variances were found to be highly significant for all studied traits. The ratio of σ² gca / σ² sca values were less than unity for all studied traits indicating the preponderance of non-additive genetic variance in the inheritance of these traits. High broad sense heritability estimates were observed for all studied traits suggests high component of heritable portion of variance, which is the portion exploited by rice breeder and that selection for these traits can be achieved directly based on their phenotypic performance. While, heritability estimates in narrow sense was relatively low for the same traits. According to the mean performance for the studied traits, cluster analysis divided the six rice parental varieties into tow major group based on days to heading (day), plant height (cm), spikelets panicle^-1 and spikelets fertility%.