Abstract: Analysis and comparisons of expression patterns of isozymes and proteins in artificial polyploid lineage among hybrids between common carp and crucian carp, including red carp, red crucian carp, mirror carp, diploid hybrid between common carp and crucian carp, gynogenetic diploid hybrid, triploid hybrid, multiple triploid hybrid, allotetraploid and its second generation, have been carried. Results revealed that there were 4 expression modes of parental alleles in their offspring:)1)simultaneous expression of both parental alleles,)2)expression of paternal alleles was inhibited, but maternal alleles were preferentially expressed,)3)expression of maternal alleles was inhibited, but paternal alleles were preferentially expressed,)4)alleles of two parental were inhibited to a certain extent or were not expressed completely. Among these 4 expression models the mode)1)was the principal model. According to these gene expression modes, different biotypes of this lineage including diploid, triploid and tetraploid hybrids could be distinguished from each other and from their original parents easily.