Two rice of three-line restoring lines, Luhui8258 (High combining ability R-line) and Yanghui34 were crossed to produce F1 hybrids which were consisted of 140 lines of F8 by seven consecutive self-crossed. Diallel crossing group were constructed by adopting NCⅡ mating design through crossing three types of cyto-plasmic male sterile (CMS) lines (they were Gang46A, Ⅱ–32A and Lu98A) with hybrids from 140 lines of F8 and parental lines of Luhui8258 and Yanghui34. The general combining ability (GCA), heritability, and correlation of general combining ability among 5 traits (they were yield per plant, panicles per panicle, filled spikelets per panicle, fruiting rate, thousand seed weight) were studied by field experiments conducted in Deyang and Suining of Sichuan province, respectively. The results showed that the variance of general combining ability and specific combining ability of the five traits all reached significant or very significant level in two sites. Except for thousand seed weight, the broad heritability and narrow heritability of the other four traits were less than 50 % in two sites, which indicated that these traits were easily affected by environment. There were very significant positive correlation between yield per plant GCA and other traits GCA except for that of thousand seed weight. GCA of the five traits presented normal distribution among recombinant inbred lines at two sites, which indicated that they had quantitative properties, and could be researched by the QTL mapping method.