12 combinations were made between cultivated rice (Oryza sativa) and common wild rice (Oryza rufipogon) according to the incomplete diallel mating design. Quantitative analysis of the heterosis and genetic analysis of 11 agronomic characters with additive-dominative model were made for theses combinations. The results showed that the average heterosis for 12 combinations was –0.608~3.301. Strong heterosis for the panicles per plant and length/width ratio of spikelet was their main characteristic. Panicles per plant, length/width ratio of spikelet, seed setting rate and heading date for the combinations between cultivated rice and common wild rice showed stronger heterosis markedly than those for hybridizations between indica rice and japonica rice. The general heretability in the broad sense were 0.50~0.92, rather high for 11 characters. The general heretability in the narrow sense were 0.24~0.82, with length/width ration of spikelet and heading date showing rather higher general heretability in the narrow sense while the other characters were low. There existed significant or very significant phenotypic correlations and genetic correlations among 11 characters. These relationships can be the efficient reference index while making indirect selections in breeding.