The effects of morphometric attributes on body weight of Exopalaemon carinicauda were analyzed by method of path analysis. Data of ten morphometric attributes, including the body length, total length, carapace length, carapace width, carapace height, first abdominal segment height, first abdominal segment width, abdomen length, number of upper frontal eminence spin and number of lower frontal eminence spin, were collected from 177 four-month-old E. carinicauda. The correlation coefficients among all attributes were calculated, and the path coefficients and determination coefficients were calculated in path analysis by taking the body weight as a dependent variable, and the other ten morphometric attributes as independent variables. Path analysis indicates that the path coefficients of four morphometric attributes (body length, carapace width, carapace height, first abdominal segment width) to body weight achieve significant difference (P<0.01) level. These attributes are significant factors determining body weight, among which body length weights the most (0.468**). While the direct effects of total length, carapace length, first abdominal segment height, abdomen length, number of upper frontal eminence spin and number of lower frontal eminence spin to body weight are quite small, therefore, they are the insignificant factors influencing the body weight and eliminated. The stepwise regression analysis establishes a multiple regression equation on the effects of body length, carapace width, carapace height, first abdominal segment width on body weight. The regression intercept and partial regression coefficients of the equation are -3.277, 0.470, 0.980, 0.528 and1.942. Judging from the high multiple-correlation coefficient (R2=0.976), the main attributes (body length, carapace width, carapace height, first abdominal segment width) determining the body weight have been selected.