A photon tracking model for heat radiation attenuation with water fogs was established based on the Monte-Carlo Method. The parameters of the water fogs such as extinction coefficient, concentration and the asymmetry parameter were analyzed, all of which had impact on the extinction character, and it was found that the asymmetry parameter was also an important one. The research indicates that for the medium with the same extinction coefficient, the lower the value of the asymmetry parameter is, the more exquisitely the water fogs can build down the heat radiation, however one can′t get the conclusion based on the Lambert-Beer′s law; when the radiuses of the water fogs are much bigger than the infrared wavelength, the attenuation effect can be enhanced by increasing the mass concentration of the water fogs and decreasing the radiuses of the particles.