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With the crisis of energy becoming more severity, the research of cutting down the drag of commercial vehicles is more and more important. In this work, to reduce the drag of a van body truck, aerodynamic drag reduction designs are carried out by the method of numerical simulation. Plates are fixed on the aft-body with different angle of declination. The effects of reducing drag are studied and the mechanism is discussed. The paper selects four rear add-on devices with different obliquity by 5deg, 10deg, 15deg and 20deg. Seen from the results of numerical simulation, the rear add-on device can reduce the drag effectively. The CFD simulations indicate that addition of the flat plates reduces the drag about 5∼8%. When the declination angle is 15deg, the effect is the best and the drag of the truck model is reduced by 8.9% comparing with the configuration without add-on device. This work can offer important references for the optimize design of van body truck.