Abstract: In the course of light reflection,light refraction,light absorption and light scattering,not only its intensity but also its polarized state are changed,so the polarized state,a kind of information,can be used in the remote sensing. Water polarized reflectance data from the three reservoirs in Changchun city were collected with a kind of bi-directional reflectance detection instrument.The specialties of this instrument lie in its ability to measure the polarized reflectance of targets at various zenith viewing angles,incidence light zenith angles and azimuth angles with band A(630~690nm)and band B(760~1100nm).Hence,the analysis,according those characteristics,listed above is done.It is found that the polarized phenomena are an important characteristic of water. This study on polarized reflectance of water not only helps to find a new way for polluted water detection,but also provides a theoretical basis for the further research on polluted water polarized light remote sensing.