Abstract: In this paper,the heterologous genetic materials in allogynogenetic crucian carp and its artificial hybrids were analysed by using the method of dot hybridization of DNA.There were some positive dots when the DNA in two clones of allogynogenetic crucian carp and their artificial hybrids were crossed with the pieces of DNA in red carp.Based on this result,it was suggested that,in the breeding of the allogynogenetic crucian carp and its artificial hybrids, some pieces of paternal DNA can integrate to maternal DNA at random,resulting in the effect of allogynogenesis',i.e.the allogynogenetic offspring have higher growth rate and some paternal characteristics.