This paper aims to study the characteristics of heat transfer for concrete radiant ceiling and its cooling capacity. A two-dimensional stead-state heat transfer model on the basis of simplified RC (Resistance and Capacity) Method was adopted to simulate the inner heat-transfer condition of concrete ceiling as well as the temperature fields. The calculated results showed that the cooling capacity of concrete radiant ceiling was affected by the temperature of supply water, distance of tubes and water flow rate. When the supply water temperature, flow rate and indoor air temperature ranged from 11~14 ℃, 0.26 ~0.33 m3/h and 25~26 ℃, respectively, the cooling capacity varied from 40 to 50 W/m2. The simulation models were also validated by experimental results, and the calculation error was less than 6%.