Abstract. To make a robot team perform a soccer game, various technologies must be developed. To date, we constructed a multi-sensor based mobile robot for robotic soccer research. Based on this platform, we have implemented some behaviors for playing soccer and the vision system with on-line visual learning function. This year, we refine behaviors for playing soccer since we improve a motor control system. Furthermore, we put an omnidirectional camera in addition to an active vision system so as to enlarge view of our soccer robot. This paper presents the design methodology of our robots.