Abstract: Eight half-sib families and 16 full-sib families of F₂ generation of Patinopecten yessoensis were developed as experimental materials for obtaining fast-growth families and evaluating the genetic parameters of growth traits in early and medium-term.Four traits(shell height,shell length,shell width and body weight)were measured from 7-months to 13-months,coefficient of variation and multiple comparison of 4 traits were analyzed,heritability and repeatability were evaluated,and phenotypic correlation and genetic correlation were estimated.The results showed that the variation coefficient of body weight ranged from 37.40% to 69.81%,more than that of other traits,while,the variation coefficient of shell hight ranged from 12.74% to 22.77%,less than that of other traits,which indicated that growth traits of Patinopecten yessoensis had great potential for breeding improvement.Py11-02,Py11-15 and Py11-03 were identified as fast growth families by analysis of multiple comparison of 4 traits.Heritability of shell height,shell length,shell width and body weight were 0.220-0.586,0.151-0.511,0.200-0.742,0.219-0.617 respectively,belong to high or medium heritability.The repeatability of 4 traits were 0.11-0.29,0.08-0.25,0.10-0.36,0.11-0.30 respectively,belong to medium or low repeatability.Phenotypic correlation of shell height,shell length,shell width for body weight were 0.926-0.935,0.929-0.943,0.692-0.981 respectively,all of that reached extremely significant level(P<0.01).Genetic correlation of shell height,shell length,shell width for body weight were 0.908-0.984,0.921-0.975,0.946-0.981 respectively,belong to high genetic correlation.The study can provide some theoretical support for breeding of P.yessoensis.