For Oujiang color common carp,Koi carp and their reciprocal hybrids(F_1),growth rates were studied by commune stocking,morphological variation was studied by cluster analysis and discriminant analysis.The results showed the instantaneous growth rates(IGR)of reciprocal hybrids(F_1)were lower than their parents,and the absolute growth rates (AGR)of them were between that of their parents.Some morphological traits of reciprocal hybrids(F_1)were between that of their parents,some better than their parents,and some worse than their parents.Generally Koi carp gave a stonger influence to the hybrids than Oujiang color common carp,and the interaction between parents also played an important role in heredity.