Abstract: The study is emphasized on the characteristics of the hybrid (de-nominated Ying hybrid) of female mirror carp crossed with CyCa F2 hybrid. Theyearling Ying hybrid exhibited an average 47-109% better growth in weight thanthe parental individuals, and two-winters old individuals increase 60.1% and75.11% respetively. In polyculture of 525-1200 Ying hybrid fish of 1(1:2) inches inlength in a fingerling pond per ha, they can reach the weight of 618-1300g, withthe biggest being 2.4kg. The Ying hybrid not only grows faster but also is easierto maintain and produce than tri-cross hybrid carp. It is suitable to be popularizedamong fish-culture industries. The Ying hybrid contains 74.58% of flesh, butCyCa F₂ hybrid and mirror carp only contain 61.7% and 74.2% respectively. Themusculian protein contents of the Ying hybrid, CyCa F₂ Hybrid and Mirrorcarp are 18.35%, 17.37%and 16.95% respectively. By means of cluster analysis of fuzzy mathematics, it comes to a conclusionthat the Ying hybrid and its reversely crossed one are more alike to CyCa F₂hybrid, especially to the female in characters such as body depth and width andhead length. The experiment has shown that the approach to combine biotechno-logy with the traditional selective breading techniques is feasible and can achieverather satisfactory economic benefits.