In order to improve the endurance of the vehicle, with the goal of reducing the vehicle’s wind resistance and optimizing its aerodynamic performance, taking the vehicle’s aerodynamic development process as the starting point, the fluid analysis software STAR-CCM+ is used to simulate the aerodynamic performance of a certain pure electric SUV model. Taking into account the principles of overall aerodynamic design, the definition of styling style, and engineering feasibility, multiple drag reduction optimization schemes are proposed from the perspectives of exterior styling and bottom guard plate. (1) Based on the principle of “front circle”, the airflow in the front bumper area is separated and optimized into a more body fitting surface, reducing the positive pressure and energy dissipation at the front; (2) Based on the “behind rear” principle, effective improvement of the airflow state at the rear end is achieved through tail wing sealing, partial downward pressure on the roof, inward retraction of the side wings in Y direction, partial upward movement of the tail light area, and optimization of the bottom profile of the rear bumper, which increased the negative pressure at the rear and further reduced the overall wind resistance of the vehicle; (3) By optimizing the aerodynamic wheel rims, flattened full coverage bottom guard plates, and other local details, the vortex shape in the wheel cavity area and the flow of bottom airflow are effectively improved, ultimately resulting in a drag reduction rate of over 30% for the SUV. The drag coefficient is controlled within 0.28, effectively reducing the overall drag coefficient of the vehicle, meeting the development needs of vehicle performance, and improving the endurance of the SUV model.