The work aims to optimize the industrial shape of a special ground vehicle, and improve its survivability in radar detection environments so as to enhance the stealth capabilities of special ground vehicles, and expand the modeling design features of the vehicles. Firstly, the modeling design features of the body were summarized based on radar stealth design principles with the body modeling outline as the design element. Then, shape grammar and parametric design tools were used to conduct multiple body modeling designs with the body modeling outline constructed. Finally, the RCS values of different modeling schemes were calculated through numerical simulation and the most optimal scheme was selected to conduct detailed modeling design. Overall, all optimized design schemes exhibited a comprehensive decrease in RCS values compared with the original body. The optimal scheme achieved a 55% reduction in RCS values, with maximum reductions of 58% for front view angles and 43% for side view angles. These results successfully met the expected design goals and effectively enhanced both overall modeling and stealth performance of the body. In conclusion, taking wheeled special vehicles as an example, radar stealth design principles were utilized to construct multiple body modeling schemes with shape grammar and parametric design tools. Through RCS simulations, the study provides rational verification and evaluation for optimizing stealth modeling designs of special vehicles while improving efficiency in multi-scheme body modeling designs. It also offers valuable insights for industrial designers working on stealth models for special vehicles.