Abstract: The experimental studies on the influences of pedestrians stop on the movement of crowd with groups were conducted in this study. Result showed that the walking speeds of group members and individuals decreased due to the group behavior and the stopped pedestrians. This decrease of walking speed of large group in the crowd is more remarkable. When hindered by the stopped pedestrians, the other pedestrians detoured. The individuals were apt to detour by the side of the stopped pedestrians. The walking behavior of groups when they detoured the stopped pedestrians depended on group size. The large group changed their configuration to gather as much as possible when they stopped,in order to avoid collision with the rear pedestrians.