Abstract: The method which could continuously polymerize and accumulate different favorable subspecies gene was used in this study. 12 restorer lines of different Indica-Japonica differentiation types and 8 sterile lines of two and three-lines were used as materials in this study. The combining ability and group genetic parameters of 6 lodging resistance traits were synthetically analyzed based on p×q incomplete diallele cross (NCⅡ) design by using 12 restorer lines and 8 sterile lines (12×8) as experiment materials. The results show that: The heredity of lodging resistance in 6 stem traits is influenced by the additive gene effect and non-additive effect of parent at the same time. The heredity of lodging index and breaking resistance is mainly controlled by the non-additive effect of parent. Plant height, bending moment and stem elliptic sectional area are mainly controlled by additive gene effect. The functions of additive gene effect and non-additive effect of parent on stem wall sectional area of the progeny are quite consistent. The genetic effect of the restorer lines play an important part in the lodging resistance of stem traits for hybrid combinations. The breaking resistance and bending moment are influenced not only by the specific combining ability of parent but also by the general combining ability of the restorer lines. K17A , Guangkang13A and II-32A could play down the transgressive heterosis of plant height in the Indica-Japonica hybrid and enhance the lodging resistance. Minghui509, Minghui512, Minghui502 and Minghui398 have more obvious advantages than other restorer lines in reducing lodging index, what is more, the general combining ability in plant height is negative effect. The 4 restorer lines have important utilizable value to enhance the lodging resistance of stem in breeding practice.