This paper investigated the effect of rear end deflectors on the near wake and aerodynamic drag of an Ahmed model with 25° slant angle. Drag reduction was compared for deflectors mounted on the two side faces and on the upper edge of the rear slant. The width of deflectors is 5mm, 10mm and 15 mm, respectively. The model scale is 1∶2, and the Reynolds number based oncoming flow velocity and model length is 8.7×105. The results have revealed that there is a pair of organized trailing vortices in the wake, which are accompanied by strong downwash flow. There is a D-shape flow separation zone on the slant face. Deflectors with a width of 5 mm at the two sides of the slant have negligible effect on the near wake, and slightly increase the aerodynamic drag by about 2.1%. On the other hand, all tested horizontal deflectors at the top edge of the slant and deflectors with a width of 10 mm and 15 mm at both sides of the slant considerably weaken the trailing vortices. The horizontal deflectors avoid flow re-attachment on the slant and suppress the D-shape separation zone, corresponding to the maximum drag reduction rate of 11.8%, which is higher than that of the deflectors on both sides of the slant.