According to the research,the elderly throw back their head in a long time will oppress the cervical vertebrae and might cause a stroke condition. When the elderly shampoo their hair alone,they need more strength to lift their arms and they can`t keep the posture continuously because of their powerless arm muscles. Switch to the posture that leaning forward,might reduce discomfort when shampooing. On the modeling design,we add a supporting function makes the elderly can shampooing by themselves easily.