A method and a system for at least two autonomous vehicles to safely pass through a road intersection are provided. The method includes providing an information receiving circle in each of the maps circling the road intersection, providing a broadcasting circle circled by the information receiving circle concentrically, circling a road intersection, traveling all autonomous vehicles toward the road intersection and into the information receiving circle, traveling one of the autonomous vehicles into the broadcasting circle for broadcasting traffic information, receiving traffic information of the autonomous vehicle traveling in the broadcasting circle by the other autonomous vehicle, and determining which autonomous vehicle passes through the road intersection first according to the traffic information broadcasted by the autonomous vehicle. When the other autonomous vehicle makes a determination to let the autonomous vehicle pass first, the other autonomous vehicle stops before the intersection until the autonomous vehicle has passed through the road intersection.