We constructed an F₂ genetic segregation population crossed by parents between a flat-leaved inbred line ‘0835’ and a feathered-leaved inbred line ‘0819’in ornamental kale(Brassica oleracea var.acephala).Four feathered-leaved related traits,i.e.leaf length,leaf width,leaf index and number of serrated leaf margin,were investigated at rosette stage.The genetic segregation analysis was conducted by using four generations(P₁,P₂,F₁ and F₂) mixed major gene plus polygene inheritance model.The results showed that:(1)there are prominent helerosis in the trait of number of serrated leaf margin.Meanwhile,these four characters showed negative transgressive heterosis.(2)Genetic analysis of quantitative traits indicated that leaf length and leaf width were both compatible with E-4 model characterized by two equal additive major gene plus additive-dominant polygene.The heritabilities of major gene and polygene were 83.80% and 1.05%,respectively,in leaf length.The heritabilities of major gene and polygene were 22.28% and 61.92%,respectively,in leaf width.(3)Leaf index and number of serrated leaf margin both meet E-1 model showing two additive-dominant-epistatic major gene plus additive-dominant polygene.The heritabilities of major gene and polygene were 93.73% and 2.59%,respectively,in leaf index.The major gene heritability was 91.18% in number of serrated leaf margin trait.