This paper presents a theoretical investigation of the interaction between optical radiation and a plate crystal as applied to bistatic polarization laser sensing of crystal clouds. A substantiation of the scatterer model choice in the form of an oriented round plate is presented. The relations for polarization characteristics and scattering cross sections as functions of particle size, orientation, and refractive index at arbitrary scattering angles are investigated numerically. A possibility of estimating microphysical, optical, and orientation properties of crystal aerosol from the data of bistatic polarization laser sensing is shown.