Abstract: We established 9 half-sibling families of Crassostrea hongkongensis using 6 parents with significant difference in body size, to compare the fertilization rate, hatching rate, survival and early growth among these families. The results show that the fertilization rate, hatching rate and survival are affected by the degree of parents' maturity.Besides, the growth rates of family CH1, CH4 and CH7 are greater than those of the others. Meanwhile, significant maternal effect is observed on early developmental stages of these families.