Thrombosis is called a time bomb, which is difficult to be detected daily. But when the time comes, the bomb will blow up the house. Even our life will take a big turn. When will this "time bomb" explode? No one knows. The concept of time has become a suspense, to be precarious. Therefore, we can do some physical prevention to mimics the contraction of the leg or plantar muscles during human activity under IPC device.