In this study,the combining ability and heritability of 10 main characteristics in hybridization between Indica and Japonica were analyzed.The results indicated that there were very significantly differences of general combining ability and specific combining ability between different societies.The broad heritability from big to small were date of heading,plant height,weight of 1000 grain of big panicle,fertility of big panicle,panicle length,total grains per panicle,grain weight per plant of big panicle,big fibrovascular bundles,areas of flag leaf and effective tillering.The characteristics of high narrow heritability were plant height,weight of 1000 grain of big panicle and fertility of big panicle.