The invention relates to a crop plant type design method. The mechanical analysis on the lodging of crops is conducted through a plant model, the appropriate plant height, the appropriate yield and other shapes can be obtained through data optimization, and therefore reference is provided for the improvement and design of the plant type. The crop plant type design method is different from a traditional method for improving the plant type through agricultural seed breeding and gene seed breeding, and the method is completed in the mode that parameter optimization is achieved on a computer. Thus, the manual and experimental cost can be reduced, the experimental period can be shortened, the theoretical foundation and the practice guidance are provided for the reasonable plant height design, and meanwhile the technical popularization on the aspect of agriculture is facilitated.