This paper deals with a quantitative investigation to the relationship between cooperative intelligence and embodiment. The robotic intelligence may be strongly influenced with the task, the environment, and the body morphology. In the task that two-mobile robots system, composed of a crawler and 1dof prismatic arm, carries a long bar horizontally along a compound road with keeping the bar-support length constant, the two pair of the robotic systems, with different body size and locomotion step width, are used in acquiring the cooperative intelligence by reinforcement learning. We investigated quantitatively the structural characteristics of relationship between the intelligence and the size of body, locomotion step width and found that the cooperative intelligence is much simpler in small-sized robotic systems than that in large-sized ones.