For the stable landing of a humanoid walking, a humanoid foot needs to reduce an impact from the ground reaction force and does not cause ZMP variation when its foot is landing. To satisfy the above condition, this paper introduces the newly designed foot mechanism has an additional shock absorbing material and guided equipment which constrains translational direction. The ability of the proposed foot mechanism is shown as the experiment which is performed in landing leg platform. The landing leg platform provides the same landing effect and a variety of condition that a humanoid robot may be faced with various environments when the humanoid foot is landing. The two kinds of experiments are performed. One verifies the capability of additional shock absorbing material and the other shows the effect of the guided equipment.