Water clouds, which are distributed at the bottom of atmosphere and composed of spherical water droplets, play an important role in Earth's radiation balance and global climate change. The effects of water clouds are based on their microphysical and optical properties. Based on the studies of water clouds optical properties in 0.865μm, the sensitivity of normalized radiance and polarized radiance intensities to water clouds optical parameters, such as effective radius, optical thickness and surface albedo, was evaluated by using vector radiative transfer model. The simulated results indicate that the information of multidirectional polarized radiance can show the microphysical and optical properties of water clouds effectively, which can be used to retrieve the properties of water clouds. This study provides the basis for using the remote sensing data of multi-angular polarization to retrieve the properties of water clouds was proposed.