Because the driver drives in the highway, the monotonous scene, the driver is led to be in the sleeping situation easily. It is dangerous to drive in the sleeping state. To solve the problem, the main research point is that notifying the driver to go back the normal driving situation. Consequently, we select the smart phone with Android operating system, use the camera and Bluetooth to detect the cars nearby the user’s car. If other cars get into the distance of being detected by device, the device would send the ring of the alarm to notify the driver. Furthermore, the simple view of the application is easily to use for the users so that we focus on designing the simple interface and uncomplicated operating process. Therefore, the users could get started with the application quickly.