Abstract: By using the polyacrylamide gel electrophoresis( PAGE) , this paper studies isozymes( LDH, EST, SOD) , haemoglobin and serum proteins of the inbreeding F1-generation gynogenetic grass carps、bisexual reproduction grass carps in the same ages and carps, respectively. The results of experiments show that there exist some differences in their electropherograms between the inbreeding F1-generation gynogenetic grass carps and bisexual reproduction grass carps; The biochemical characteristics of the inbreeding F1-generation gynogenet ic grass carps do not directly ref lect the influence by the genetic materials of the carps.