Polarization analysis method is widely used in the area of target detecting. Compare with the traditional method which based on intensity analysis and spectrum distribution analysis, the polarization analysis is dominant by analyzing the polarization ingredient of optical information. Under normal conditions, polarization analysis method can discern the given targets and determine their characteristic more precisely in a further distance. The validity of polarization analysis depends on the polarization characteristics of the targets. Our experiment indicates that some typical materials have similar scattering characteristics which could fail the traditional analysis method. Further research indicates that there are a few remarkable differences in the scattering characteristics of these kinds of materials based on which a new method of polarization analysis is given in this paper to ensure the validity of polarization analysis under more application conditions.