  We carefully examine the depolarization feature of blazars in the optical and
near-infrared bands using the sample of Mead et al. Magnetohydrodynamics (MHD)
turbulence could be one possible reason for the depolarization of
optical/infrared blazars when we apply the theoretical analysis of Lazarian and
Pogosyan. We further identify in the sample that the depolarization results
shown in most blazars roughly obey the form of the three-dimensional
anisotropic Kolmogorov scaling. The effective Faraday rotation window length
scale is not small enough to resolve the polarization correlation length scale
in the blazar sample. The depolarization and the related turbulent features
show diversities in different blazar sources. We suggest more simultaneous
observations in both the optical/infrared and the high-energy bands for the
study of the blazar polarization.
