When 50% of zygotes of Haliotis diversicolor aquatilis develop polar body . , with 6- DMAP as derivat ive , various concentration and dif ferent treatment time are used to induce triplo id by inhibiting releasing of the second polar body ò ; the experiment was carried out for productive seed breeding and culturing. Results show that when 6- DMAP is at the concentration of 300 Lmol#dm - 3 , and treatment time is 10min, the triploid rate of embryo is above 90%; In addition, embryonic hatching rate can reach as high as 85%, with larval deformity rate as low as 50%- 55% . After 7 months of cultivation, the rate of triploid of the culture abalone in test group is above 65%. On-the-spot acceptance check by experts proves that the average length of the shell of the culture abalone in test group grew 10% longer than that of control group. The average weight of the culture abalone in test group grew 30% weightier than that of the control group. Compared with diploid control group, triploid abalone displayed notable advantages in the growth of such aspect s as shell length and body weight ( t> t 0. 01( 58) ) .