In this paper,we proposed a classification method of polarimetric SAR data by combining the Pauli polarization decomposition and multi-scale markov random field.We first created the features of polarimetric SAR data by doing Pauli polarization decomposition.Then,these features were decomposed by three-layer Haar wavelet decomposition.Finally,iterative classifications were carried out in a layer and between layers to produce classification result of the polarimetric data.The experimental results by using NASA / JPL data show that the proposed method have better performance both on keeping the c...