[Aim]  To clarify the parasitic ability and developmental fitness of Trichogramma chilonis from the gray eggs of Antheraea pernyi on Corcyra cephalonica eggs, a host egg susceptible to bacteria during massive production of T. chilonis. This study aims to provide a basis for host egg quality control. [Methods]  Trichogramma offspring reared by the gray eggs served as the treatment group, while Trichogramma offspring reared by the healthy eggs served as the control group. The parasitism rate, emergence rate, developmental duration and female proportion of Trichogramma offspring reared by the two groups were compared on refrigerated 0-3-day-old eggs of the rice moth C. cephalonica. [Results]  The offspring reared from the control group (healthy eggs) significantly parasitized more eggs on refrigerated 0-3-day-old eggs of C. cephalonica than that from the treatment group (gray eggs) (P < 0.05). There were no significant difference in emergence rate and developmental duration on refrigerated 0-day-old eggs of C. cephalonica between the offspring reared from the two groups (P > 0.05). The emergence rate of offspring reared from the treatment group on refrigerated 1-3-day-old eggs of C. cephalonica was significantly lower than that from the control group (P < 0.05). However, the developmental duration of offspring reared from the treatment group on refrigerated 1-3-day-old eggs of C. cephalonica was significantly higher than that from the control group (P < 0.05). There was no significant difference in female proportion on refrigerated 0- or 1-day-old eggs of C. cephalonica between the offspring reared from the two groups (P > 0.05). The female proportion of offspring reared from the treatment group on refrigerated 2- or 3-day-old eggs of C. cephalonica was significantly higher than that from the control group (P < 0.05). [Conclusion]  The results indicated that the gray eggs of A. pernyi caused by bacteria could some adversely affect the parasitic ability and developmental fitness of T. chilonis.