Japan is facing an aging population. A ten-fold increase in the incidence of falls was reported in the elderly (over 65 years) compared to younger individuals. Just as the risk for slips and falls increases with age, so too does the severity of the outcome of these accidents. Falls are often listed among the leading causes of serious unintentional injuries. Especially risk during stair negotiation. Stair falling accidents the multiple, interacting environmental and human factors involved. Among the environmental factors are properties of the walking-surface and shoe or foot (e.g. material properties, tread). Human factors include gait, expectation, the health of the sensory systems and the health of the neuromuscular system. In short stair design and environmental conditions may play a role in slip accidents. The objective of the present study the environment of the feet which are easy to operate and more secure during stair descent. Sixteen healthy volunteers (age range 20–24; 14 female, 2 male) participated in this study. Each subject performed stair descent and walking on a force plate (Kistler, 9286BA) in all 12 conditions. Measured knee joint angle and ankle angle by reflective markers respectively. There were 4 parts of surface reflective markers below: Greater trochanter (GT) Lateral malleolas (LM) Distal phalanges (DP). Measurement of trunk accelerometer, parts of surface trunk accelerometer below third cervical spine. It was that barefoot, two slippers (simple slippers (SS) or slippers (S)), nurse Shoes × three types of flooring (solid wood (SW) or carpet (C) or solid wood with non-slip (NS)). The trials were performed that three steps stair descent or walking was right stance phase. All signals were collected of 1 kHz sampling. All statistical analyses were performed the SAS University Edition and significance levels were set at p < 5%. The results of this study revealed that descending stairs barefoot reduces posture upset and body burden on the landing area. Collectively. The risk of falling increased because the use of the elderly experience kit was painful to bend the joint and the sense of balance decreased. Risking stair descent is related not only to remove slippers. The results of this study will help you develop appropriate renovations and foot environments tailored to the living environment.