Mueller matrix decomposition method and Mueller coherence matrix method for the complete depolarization characteristics of Mie scatterers are compared. The parameters of the depolarization characteristics are discussed. It is found that when the depolarizing medium doesn’t contain other polarization characteristics, the difference between the general polarization-maintaining indexes calculated by decomposition method and coherence matrix, and the standard value will increase with the deviation degree of anisotropy coefficient of depolarization along the medium’s principal axis. The maximum divergences are 0.16 and 0.07 and the relative divergences are 33% and 15% respectively. Because of the depolarization anisotropy in Mie scatterers, the polarization-maintaining index-entropy chart can also be used to denote the depolarization anisotropy qualitatively, as well as the anisotropy coefficient of depolarization. When the Mie scatterers show other polarization properties, for example the birefringence and the optical rotation, the linear depolarization will show the anisotropic property. At the moment, the linear depolarization anisotropy factor should be introduced to completely depict the depolarization characteristics of Mie scatters.