The Angoumois grain moth(AGM),Sitotroga cerealella Olivier ,severely infes-ed the stored grain of hybrid rice ,of which the susceptibility ratio was larger than the regu-lar rice.Because the hybrid rice usually had high percen tage of gaping glumes ,the newlyhatched larvae of A GM easily penetrated into the seeds.Highly significant positive correla-tion(P<0.001) between the percentage of gaping glumes and the emerging adults ,orgrain loss was found,and a significant positive correlation(P<0.05)between the gapingglumes and susceptibility index also existed. The percentage of gaping glumes increased withsusceptibility increasing and vice versa. The cytoplasmic male sterility(CMS)line susceptibleto AGM was the major factor affecting the susceptibility of hybrid rice.Development of thenew resistant CMS or restorer line with the resistance controlled by dominant gene could in-crease the resistance of hybrid rice to stored insects.