The growth characteristics of releasing Penaeus orientalis in the Mindong waters was studied in this paper. The results show that releasing P. orientyalis in the Mindong waters has difference in the growth between females and males, like it in the Bohai Sea. The males grew more quickly than the females, but the body size of females could grow larger than that of males. The body weight of the released shrimp was larger than the natural P . orientalis living in the Bohai Sea at same body length. The inflexion of the weight growth was about 102 days. Thus, it would be a proper date to start f ishing in the mid-July that was suggested.