Abstract: As the main auxiliary transportation tool underground, the trackless rubber tire vehicle is subjected to various static and dynamic loads from the wheels and suspension due to the complex working environment underground, especially the frame, as the main load-bearing component of the vehicle, is affected. In this article, taking the WC12E (B) trackless rubber tire vehicle as the research object, and focusing on the common vulnerable working conditions during vehicle turning, a three-dimensional model of the frame is established, and the finite element calculation and modal analysis on its static strength are then carried out. The modal analysis results indicate that the idle vibration frequency of the engine is located between the fifth and sixth natural frequencies of the frame, and is close to the sixth natural frequency, which may cause resonance phenomena. Therefore, certain shock-absorbing measures should be taken in the installation design of the engine. The analysis results can provide theoretical basis for the optimal design.