The floor heating system is well known for being comfortable, is little different between the upper and lower sides, and the range of curren steam air and radiation is equal insde. Floor heating system does not spread the dust and germs since it's not heated by hot current stream air unlike convection heating system or hot air heating system whose principle is hot air in the lower side convects and makes it dry. Moreover, it has been reported that floor temperature control system is much better than convection control system which control the current air temperature for energy saving. This paper study how the body responds to the change of posture such as sitting and standing using floor radiation heating system.