This research is pivotal because an expert system is used to affect the vehicle's stability, which implies enhancing the stability and safety of vehicles. A dynamic model of the vehicle consisting of a guided front wheel and a free rear wheel is established based on the model of a four-wheeled vehicle when the vehicle moves on the curve road. Expert systems are computer programs that use artificial intelligence methods to solve problems within a specialized domain that ordinarily requires human expertise. The geometrical framework and dynamics parameters, including the factors of moving stability, vehicle moving speed, lateral stiffness parameters of the front and rear wheels, vehicle mass, and vehicle length, on the vehicle's moving stability and safety are then simulated and analyzed, respectively. Expert systems accumulate experience and facts in a knowledge base and integrate them with an inference rules engine a set of rules for applying the knowledge base to situations provided to the program. The research and simulation results show that the stability of the vehicle can be improved, and the operating parameters of the vehicle greatly affect its moving stability. The lateral stiffness parameters of the front and rear wheels should be increased, while the vehicle's mass needs to be reduced in the operating condition of the vehicle to enhance the vehicle's moving stability.