Plant height is an important characters of plant type and it play important role influence to change lodging resistance, difficulty of mechanical harvesting，yield and quality in rapeseed。six generations (P1, P2, F1, F2, B1 and B2) were produced between 10D130（semi-Dwaf Line） and Zhongshuang 11 to analyze inheritances of plant height in rapeseed (Brassica napus) by the mixed major gene plus polygene inheritance model in this paper. The results showed that the plant height of 10D130 譠hongshuang11 were dominated by a pair of major gene with additive-dominant-epistasis effects plus polygenes with additive- dominance- epistasis effects ( D model). The additive effect and dominant effect of major gene of plant height is –8.58 and 7.14. The heritability of the major gene in B1, B2 and F2 are 23.52%, 0.91% and17.81%, and the heritability of the polygene in B1, B2 and F2 are 30.05％,68.05% and 39.35%, respectively. The result implied thant not only major gene’s effect but also polygene’s effect and Environmental effect should be considered in genetic breeding for using 10D130.