| To investigate the effects of morphometric traits on body weight for Macrobrachium nipponense, 46 tails of Macrobrachium nipponense (male and female in half) collected randomly from Tongren, Jinjiang River were measured in terms of body weight(Y), total length(X1), body length(X2), carapace length(X3), carapace width(X4), carapace height(X5), first abdominal segment length(X6), first abdominal segment width( X7), tail length (X8),outside uropod length(X9), inside uropod length(X10), outside uropod width(X11), inside uropod width(X12), number of upper frontal eminence spine ( X13), number of lower frontal eminence spine(X14), Second chela length(X15). The correlation between body weight and morphological traits was analyzed by the method of stepwise regression analysis. The results showed that the body weight for male group was significantly correlated with the carapace length and carapace height (P<0.01). While the main trait affecting the body weight of female was body length and the correlation coefficient reached a significant level (P<0.01).The multiple linear regression equations were also significantly different , shown as follows: Y=-3.368+0.114X2-0.009X4+0.172X11，Y♀=-1.921+0.086X2，Y♂=-3.178+0.120X3+0.243X5. The results provided optimal measuring indexes for selective breeding of M. nipponense.
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