Experimental and numerical simulations were made on the characteristics of the temperature distribution inside building with radiant floor heating.Experiment analysis shows that one of the main features of radiant floor heating is the uniform temperature condition from floor to ceiling.The vertical air temperature difference measured in a test space is less than 0.73 ℃,and this is the reason why radiant floor heating can cause to a good thermal comfort.Experimental results show that the air temperature of the radiant floor heating room is uniform in despite of the door open or closed.Four turbulent mathematical models were validated by using the CFD software Fluent and the velocity fields and temperature fields were numerically computed by using a steady turbulent mathematical model for the radiant floor heating system.The results show that the radiant floor heating can cause to a good thermal comfort,and the standard κ-ε turbulent model can be the right simulation model for radiant floor heating.