Abstract: In order to investigate the transmission heredity of Macadamia sp. plant growth, 10 Macadamia clones were used as materials, 90 cross combinations were obtained with direct crossing and reciprocal crossing, and seedlings of 90 full-sib families were obtained. Variation analysis was carried out in aspects of seed diameters, seedling height, basal diameter and crown width. The results showed that there was significant difference (P<0.05) in the seed diameter from 10 female parents. And also there was significant difference (P<0.05) or extremely significant difference (P<0.01) in the seed diameter from 9 male combinations corresponding to one female parent. This indicated that seed size depended on its female parent, but also was affected by male parent. Variation analysis of the seedling height, basal diameter and crown width showed that there was significant difference among full-sib families and among half-sib progenies family of female parents (P<0.05), while there was no significant difference in that of male parents. Although gene from both parents played a role in the growth of seedlings, variation percentage to be affected by female parent was larger than that from male parents.