in the sensors used for path recognition in intelligent robot, the laser sensor is widely used because of its high precision and strong realtime. In this paper, for the intelligent vehicle which needs to recognize the black and white path, a set of 18 laser sensors were designed. And in sensor placement and path identification, these laser sensors were divided into 3 teams for time sharing multiplexing, and different values were assigned for different black wire positions. Then for different values, the desired pulse values for steering engine and current pulse values were debugged. With the difference of these two pulse values, the error was obtained. Thus PD control was adopted. Finally, it was shown by practical debugging that this layout of sensors, path identification and processing method can effectively identify the road information, and make the direction control accurate and smooth.