Heterosis and genetic correlations were analyzed for body weight and 10 morphometric traits flora three variants of red carp, Cyprinus carpio vat. singuonensis , Cyprinus carpio vat. wuyuanensis and Cyprinus carpio vat. color, based on diallel cross data at their adult stage. The results indicated that obvious heterosis was observed in C. carpio vat. singuonensis ? C. carpio vat. wuyuanensis, but no obvious heterosis was found in C. corpio vat. singuonensis ? C. carpio var. color and C. corpio var. wuyuanensis ? C. corpio var. color ; Significant additive correlations existed in body weight and total length, body weight and standard length （ rA 〉 0.9）, but dominance correlations were not significant between them. Significant additive and dominance correlations were found between total length and standard length, total length and caudal peduncle length, standard length and caudal peduncle length （ rA 〉 0.9; rD 〉 0.9）. Meanwhile, significant negative additive correlations existed between total length, standard length and body depth, caudal peduncle depth （ rA 〈 -0.9）. Furthermore, significant negative additive correlation （ rA = -0.896） between body weight and caudal peduncle length, and significant positive dominance correlation （ rD = 0. 970） were also found between body weight and caudal peduncle depth.