The preservation of structural information and polarimetric scattering properties is the major obstacle in despeckling for Polarimetric Synthetic Aperture Radar(PolSAR)images.Speckle reduction for PolSAR images using hybrid features similarity,to establish a method for extracting structural features by analyzing the structural feature and polarimetric information of PolSAR data,is proposed.The proposed method introduces structural characteristics as well as polarimetric scattering characteristics into the speckle reduction and in order to preserve them efficiently after filtering.The test results of real airborne SAR data show the effectiveness of the algorithm.%针对极化合成孔径雷达（Polarimetric Synthetic Aperture Radar，PolSAR）图像在相干斑抑制过程中面临的结构信息和极化散射信息保持的问题，通过分析PolSAR图像的结构特性和极化特性，建立一种结构特征提取方法，并提出一种采用混合特征相似性的极化SAR图像降噪算法。该算法将图像的结构信息和极化散射信息与降噪过程相融合，能够在抑制相干斑噪声的同时，实现降噪后图像的结构信息和极化信息的有效保持。实测机载极化SAR数据的实验结果验证了算法的有效性。
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