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Silique is one of major factors influencing rapeseed yield.Genetic models of silique body length(SBL),valid silique length(SL)and beak length(BL)were studied in the cross of Zhongshuang11(P1)× 10D130(P2),in which P1 is a long silique variety and P2 is a short silique line.SBL,SL and BL of six populations,which included P1,F1,P2,F2,BCP1 and BCP2,were studied by joint segregation analysis.The frequency distributions of F2,BCP1 and BCP2 generation exhibited to have multi-model patterns,which implied the function of major genes and polygene.In order to disclose their genetic bases,the most suitable models about silique traits were selected among 23 genetic models.The results showed that SBL,SL and BL were mainly influenced by two pair major genes with interaction effects of polygene,and were well sketched by E-0 model,E-1 model and E-3 model,respectively.Heritabilities of the major genes controlling SBL and SL ranged from 47.63%to 79.45%,and the polygenic variations ranged from 12.47%to 29.40%in separation populations.Heritabilities of major genes controlling BL were 33.71%,72.75%and 52.25%,and polygenic variations were 40.08%,5.37%and 27.60%,respectively.Consequently,the observations indicated that three silique-length traits were mainly influenced by two pair major genes with different interaction effects.