On the basis of analyzing the heat transferring rule of the floor radiant cooling system,the mathematic model of two-dimensional steady heat transferring is set up.Moreover,by using FEM,the ground temperature is worked out.According to the law of the ground temperature changes with the mean temperature of the supplied water and returned and indoor temperature,the mean temperature of the supplied and returned water is obtained.Finally,specific measures are suggested on condensation-prevention,which can be us...