As a complex load-bearing system, high-speed tracked vehicles not only need to have certain protective capabilities, but also need to be able to withstand the effects of various excitation sources. With the emergence of lightweight design requirements for vehicle bodies, research on the design of such high-speed tracked vehicles is gradually deepening. The modal analysis of vehicles is related to the reliability design of the vehicle bodies. However, current research on the modal characteristics of lightweight high-speed tracked vehicles is mainly based on experimental methods, which cannot conduct extensive research on the dynamic response of vehicle bodies under different application conditions. Modal calculation and analysis were conducted on the vehicle body model of a lightweight high-speed tracked vehicle based on the finite element method, and the model was modified combined the experimental modal test results. And, the suggestions were made for optimizing the design of the vehicle body. The modified vehicle body model and modal characteristics were contributed scholars to analyze the rationality of relevant vehicle structural design, thereby avoiding resonance during vehicle movement. Moreover, the research results are expected to be applied to analyze the dynamic characteristics of the vehicles under different working conditions, and provide reference and guidance for the design and modification of the lightweight high-speed tracked vehicles.