The polarized reflectance characteristics of different vegetation canopies are analyzed based on field and laboratory multi-angle polarization measurements and physical mechanism of polarized reflectance. The parameters of two polarized reflectance models are obtained respectively. The results show that the polarized reflectance factors of vegetation canopies depend on the geometry of viewing and incident angle, the distribution of polarized reflectance of vegetation canopies is anisotropic and related to the structure of canopies. The polarized reflectance ratio reaches 0.095, much larger than the previous results. The polarized reflectance factors of vegetation canopies are effectively calculated by the polarized reflectance models, but there will be a large error when for flat-type and smooth blade canopies.