The dynamics simulation was made based on the cosimulation modeling of the mechanical system and the hydraulic system model of the 220 ton electric wheel mine truck. At first, a fourwheel and doublefreedom (2-D) mathematical model was established which was more reasonable than a “twowheel and 2-D”. The stable steering property of the 220 ton electric wheel mine truck was analyzed, and a stable steering simulation in ADAMS was carried out. At last, the stress analysis of steering cylinder and steering tie rod on multiple conditions by the cosimulation model was made. The results verify that the correctness of hydraulic steering system of the mine truck, and the sample car has an understeering property, with good handling stability.