Road Traffic Marking highway facilities is an important component, in recent in our country, the speed of highway construction has noticeably accelerated, road lines painting work seems very heavy, the demand of Road Marking Machine also significantly increased. But the existing baseline for the road marking, the work of Marking Machine is not satisfactory, because the controlling components are unsatisfactory and the line painting work is inefficient. Even if the line drawing truck, the driver also needs to be marking time focused on the road and crossed to the baseline, one can imagine the degree of fatigue, if unawareness, the standard will be set aside rather than a line, it would be a waste paint, but also affect the progress of the project, these conditions produced mainly because of the lack of proper control body functions. Against the above problem, the invented lines striping assist device, although finding a solution narrow range, but increased marking machine efficiency and quality of the work, for example, ultrasonic range finder based on the automatic tracking system. Highway cross line drawing and computer-aided identification system, at the same time introduced some related solutions. However, the road has been the need to benchmark the line marking the road, no practical assist device, this paper pushing this issue and hands-line cars, a study based on visual crossed the road of automatic detecting device. The use of digital image sensor device Acquisition Road Marking baseline. image through the digital signal processor for digital image processing; based on Hough transform thinking straight and improved methods to extract baseline, judge baseline and cross-spraying device to the Deflective angle, set a limit angle, when the angle is less than this limit, showed that the angle, and- angle feedback to the controller, thereby implementing agencies to achieve control spraying device along baseline spraying, when the Deflective angle greater than the limit, the system raised alarm to alert staff on the direction of the line for a manual adjustment. Zhengzhou Dayu Road Marking Machinery Company was founded in the year 1992. As highway painting devices supplier, we are slao exporter of road marking materials and road paint in China. our renowned products are traffic coating facilitie and kinds of qualified traffic marking paint! Dayu line striping device has been sell well in China and have been exported abroad for our various strict product lines, reliable product quality, considerate sales service and competitive price! For more details, models and types, please visit our machine website www.road-marking-machine.com! 1200kg