In 1978-1981,the inheritance and combining ability of rice resistance to bacterial blight(Xanthomonas oryzae)has been observed with twelve verities and thirty combinations.The results indicated that 1) the greater value of The inheritance in broad sense of the resistance of F₁ and F₂ population of crosses and the quicker relative genetic advance proved that the resistance of the combitation of crosses can be selcted in the earliest generation.2)The variance of general combining ability was highly significant(i.e.p<0.01)and the ratio of GCA:SCA was also higher.This showed that the variance of additive gene was marked.3)The effect of general combining ability of parents was of definite direction.The square deviations of the resistant parents were of negative value,while those of susceptible parents were of positive value 4) The effect of specific combining ability of parents was of one definite direction.5) The effect of resistant inheritance was stable for IR26 and IR36.