A new ceiling radiant cooling panel(CRCP) with a uniform temperature distribution in the surface was introduced, by analyzing the physical structure and heat transfer mechanism of CRCP. A mathematical model of the radiant heat transfer process was established, through which the cooling capacity of CRCP was calculated using MATLAB. Compared with the results of thermal performance test, the mathematical model was reasonable with a maximum error less than 6%. According to the results of model and experiment, in the constant flow condition, due to the air in the sandwich structure, cooling capacity of CRCP decreases as the temperature drops. Limited by the chilled water temperature, the temperature of CRCP usually is in range of 18~20 ℃. Based on the experimental ，the distribution of relative humidity and the temperature in the room and cold load undertaken by convection and radiation respectively in the room were also studied, aiming at providing some relevant basis for the application of CRCP system.