Basic relation between the ski deflection and snow groove curve has been investigated at first. On the base of this knowledge, measurement result on the relation among the snow groove size, ski deflection and contacting pressure has been investigated. In case that snow groove depth is small, pressure concentrates around the boot center area. In case that snow groove depth is large, pressure distributes wider in the long area before and back of the boot center. Although pressure distribution changes remarkably with the snow groove depth, ski deflection does not change so much. The relation between the penetration depth and the pressure has been estimated from the measured ski deflection and the pressure. The study on the relation between the formed pressure distribution by the penetration and the ski deflection with the property of the ski stiffness will be the future subject.