Abstract: Hybrid combinations of cucumber（Cucumis sativus L.）were made with two inbred lines
with different immature fruit skin color. The C and L values of immature fruit skin color were measured by
color difference meter after visually classified. The generations of F₁，F₂，backcrosses B₁ and B₂ and their
parents P₁ and P₂ were used to explore the inheritance of immature fruit skin color traits with the method
of conjoint analysis. The results showed that the major gene and polygene（E-0 model）inheritance of
immature fruit skin color in cucumber accorded with the additive-dominance-epitasis pattern. The L value
and C value of major gene heritability in F2 are 93.61% and 80.86% respectively. The major gene
heritability in F2 is higher while the polygene heritability and environmental effect are lower，so we
suggest that the fruit skin color breeding of cucumber should be selected in the early generation.

Key words: cucumber, immature fruit color, color difference meter, genetic