Based on the design of the controler of traffic lights of single flat machine Abstract: In recent years, with the rapid development of science and technology, the application of SCM is continuously to further, traditional control test rapidly updated. In the intelligent detection and control systems, often used as a core component chip, then to use with specific hardware structure, and the view of the specific application software, the object characteristics. At the intersection of cars, bustling, if no effective pedestrians, appear easily controlled. But only in a traditional way to directing traffic or words can not meet the needs of today's urban transportation, therefore with intelligent traffic control light. There are many ways to control traffic lights low high control functions and multi-level. The traffic light by single-chip microcomputer control system is controlled in learning is one of the most typical design, is also extremely practical significance to study. This design is relying on the single chip microcomputer, combined to form a LED display the function of intelligent medium road control system. In order to system is stable and reliable MAX706 adopted watch-dog chips, to avoid the system crashed and stop work because of the situation. Keywords: singlechip intelligent traffic design watchdog