The use of solar reflective coatings on the building envelope can reduce the energy consumed by the air conditioner and provide a thermally comfortable indoor environment. Performance of the energy saving coating is closely related to its reflectance. The higher reflectance in the solar spectrum,the more energy could be saved. The effects of wavelength,incident angle and thickness of the coatings on reflectance are investigated based on the measurement results. The bidirectional reflectance distribution functions (BRDF) at visible wavelength 635 nm and near-infrared wavelength 980 nm are measured and the effects of coating thickness on the normal-hemispherical reflectance which is calculated from the measured BRDFs are discussed. The results show that there is a remarkable peak at the specular direction in the BRDFs. The peak value becomes high as the incident angle and wavelength increase. The thickness has insignificant influence on the normal-hemispherical reflectance,which is 83% at 635 nm and 75% at 980 nm,respectively.