To determine the effect of main morphological traits on the body weight of and to offer strategies for parent selection during the breeding of , the correlations between the morphometric attributes and body weight of were explored by the correlation, path, and regression analyses. One thousand individuals from each of traditional shell, golden shell, white shell, red shell, and black shell oysters were randomly sampled to measure their body weight (BW, g) and four morphometric attributes, including the shell length (SL, mm), shell height (SH, mm), shell width (SW, mm), and hinge length (HL, mm). The correlation coefficients among all variables were calculated. The path coefficients were calculated by setting the body weight as a dependent variable and other attributes as independent variables via stepwise elimination. The results showed that the four morphometric attributes of the five kinds of oysters extremely significantly (<0.01) correlated with body weight. The shell length presented the highest correlation with the body weight of traditional, white, and red shell oysters, and the shell height showed the highest correlation with the body weight of golden and black shell oysters. The results of the path coefficient analysis showed that the shell length of traditional and white shell oysters, the shell height of golden and red shell oysters, and the shell width of black shell oysters showed the highest correlation with body weight, and exhibited predominant direct effect and determinacy on the body weight for . The multiple regression equations were obtained to estimate body weight as traditional shell golden shell color:BW=-38.661+0.305SL+0.477SH+0.242SW+ 0.375HL; white shell red shell color:BW=-27.307+0.327SL+ 0.321SH+0.252SW+ 0.305HL; black shell color:BW=-40.921+0.278SL+0.335SH+1.076SW+0.269HL. The clustering results showed that the morphological traits were more similar between the traditional and golden shell oysters and between the white, red, and black shell oysters.