Abstract
Final goal of this research is to develop a safety and efficient system for agricultural robot which is able to do the cooperative work with human workers in the same working environment. In this paper, a conception of safety and efficient robot system was discussed, and secondly, a degree of danger was evaluated. Thirdly, a manipulator control according to the degree of danger was simulated by a computer. From the results, it was observed that the robot could safely and efficiently be controlled by determining its motion based on the degree of danger.