In this paper, the thermal comfort of floor radiant heating was investigated by experimental and numerical methods. The results show that: with the increase of the inlet water temperature, the indoor temperature appears a gradual upward trend, and the vertical temperature appears stratification phenomenon and the values of indoor temperature measured are slightly lower than the numerical calculated values. The thermal comfort with 50 ℃inlet water approach better condition through comparing the PMV-PPD index, indoor temperature distribution and inlet water temperature of 45 ℃, 50 ℃and55 ℃. Indoor air flow in the three conditions is both within the body acceptable range, and the impact on indoor thermal comfort can be ignored.