Flue-cured tobacco variety K326 was taken as the test material, different combinations of nitrogen fertilization and leaf number remained were set up to get different plant types of flue-cured tobacco, then the relationship between plant type and yield & quality of flue-cured tobacco were analyzed so as to put forward the dynamic change pattern of the ideotype. The results showed that the yield of flue-cured tobacco increased with the increases of leaf layer height and width, root length and volume, net assimilation rate (NAR), crop growth rate (CGR) and leaf area duration (CGR). With the increases of leaf layer width and top leaf width, tobacco quality showed a parabolic trend. The dynamic change patterns of the flue-cured tobacco were derived from the combinations of three plant types, which included table shape (T), drum shape (D), and cylinder shape (C), respectively. Five patterns were divided and compared, among of them, T-D-C pattern belonged to the type of low production and medium quality. T-D-T-C pattern was harmonious in chemical components and appropriate in leaf weight, belonged to the type of low production and medium quality, as well as appropriate production and better quality. T-D-T-D-C pattern was harmonious in chemical components, appropriate in leaf weight and stem proportion, belonged to the type of low production and better quality, as well as appropriate production and better quality. D-C pattern was unharmonious in chemical components, great weight in leaf and high proportion in stem content, belonged to the type of appropriate production and poor quality. D-T-D-C pattern was unharmonious in chemical components, big weight in leaf and high proportion in stem content, belonged to the type of appropriate production and poor quality, high production and poor quality, as well as high production and medium quality. Therefore, the dynamic change pattern of ideotype of flue-cured tobacco was T-D-T-D-C pattern.