合成孔径雷达（ＳＡＲ）因为相干成像原理所固有的相干斑噪声是影响其图像质量的主要原因。文中根据ＳＡＲ图像的纹理特征和相干斑噪声的统计特征，提出了一种基于区域分集的相干斑抑制算法。本算法能够完全保留ＳＡＲ图像边缘特征，同时对相干斑具有较好的抑制能力。实验结果表明，本算法处理效果优于目前常用的相干斑滤波算法。 Synthetic aperture radar (SAR) speckle noise inherent in coherent imaging is the main reason for its image quality. According to the statistical features of texture features and speckle noises of SAR images, a new speckle reduction algorithm based on region diversity is proposed. The algorithm can completely preserve the edge features of SAR images, and has better suppression of speckle. Experimental results show that this algorithm is better than the commonly used coherent filter algorithm.