To evaluate the culture performance of triploid Crassostrea angulata cultured in inner and outside Huangqi Bay,9 month ages oysters rope-cultured were sampled randomly in Huangqi Bay,Lianjiang,Fujian Province.The shell length(X_L),shell width(X_W),and shell height(X_H),as well as the total weight(TW) and meat weight(MW) were measured for 85 individuals respectively.One-way analysis,multiple regression analysis and path analysis were used for investigating the morphological variation.One-way ANOVA showed that besides shell height,all morphological parameters of the oysters cultured outside the bay were significantly larger than those in the bay.The oysters cultured outside the bay were more round at shape and higher in meat condition.The optimum multiple regression equations were obtained though stepwise multiple regression analysis.As path analysis,the direct effects of morphological parameters on total weight were in order of shell length>shell width>shell height.Shell length had the maximum direct effect on the total weight,and was the major factor.The correlation indices (R²) of morphological parameters against the total weight was less than 0.850,indicating some other factors associating total weight,besides shell length,shell width and shell height,such as meat condition and shell weight.