Because astronauts have been in a weightless environment for a long time and have always been in a floating state, their bodies have already adapted to the weightless environment and constant source. After returning to the earth, because they are used to the weightless state in space, their body consciousness cannot be adjusted immediately and they cannot walk normally. Therefore, astronauts need to be carried when returning home, and more importantly, astronauts are affected by weightlessness in space for a long time, Muscle tissue is atrophied and osteoporotic. After returning to the earth, the weight of the body will be more than 100 kg. The spacesuit will crush the astronauts and fracture them accidentally. Therefore, you should try to sit down to prevent accidents. In addition, after living in space for a period of time, the brain consciousness will be more or less confused, which will cause changes in space perception, and people will feel dizzy, weak on the soles of their feet, and unstable standing, Therefore, after returning to the earth, astronauts should also have some physical rehabilitation training, which can help astronauts recover life on the earth more quickly.