The main reason for the aerodynamic drag in the car is that the flow separation on the rear of the vehicle body. In order to delay the disruption of this flow, the Vortex Generator is used in recent vehicles. Vortex generators are commonly used in aircraft to prevent the separation of the flow. vortex generators create their own drag, but due to splitting the stream on the downstream, the drag also reduces. The effect on the shape, size, and orientation of the vortex generator is dependent on. CFD analysis confirms that the use of vertex generators reduces both the drag & lift coefficient. Therefore, an optimized size is required with the right orientation to get great results. This paper represents the effect of the flow of generators on a different orientation and the effect which has the effect.