In the military and civilian fields, the study of radar scattering coefficient has significant academic value and broad application prospects. Research on the difference between the co-polarization and cross-polarization scattering coefficient is relatively litter. P-band radar scattering coefficient data for typical objects is no publicly available. Initially, this paper studies scattering characteristics of typical objects in the L band. The relationship between radar scattering coefficient and incident angle is analyzed based on the measured data at home and abroad, and the differences between HH polarization and HV polarization are compared. Furthermore, the radar scattering coefficients of typical ground objects in P band are calculated based on the recently radar flight test. The relationship between radar scattering coefficient and incident angle is also analyzed. The differences between HH polarization and VV polarization are calculated. Lastly, radar scattering coefficient of P and L band is compared. Results demonstrate that L-bandradar scattering coefficient difference between HH polarization and HV polarization decreases with increasing incident angle. At a fixed incidence angle of 40°, radar scattering coefficient is about 10~13 dB. P-band theradar scattering coefficient decreases with increasing incident angle,which is 1-2 dB lower than L-band radar scattering coefficient. P-bandradar scattering coefficient difference between HH polarization and HV polarization decreases with increasing incident angle. The research in this paper can accumulate data for remote sensing application of P and L land radar, and provide help and reference for polarimetric SAR to retrieve target information.