介绍空间域InSAR干涉图的滤波方法,综合自适应中心加权中值滤波和最优方向滤波两种方法的思想,提出基于最优方向自适应中心加权中值滤波方法。分析边缘保持指数指标及其不足,提出改良的边缘保持指数指标。采用模拟数据和真实数据进行实验,结果表明,新滤波方法不仅具有较好的噪声平滑效果,而且有很强的边缘和细节信息的保持能力。 This paper introduces the filtering methods of InSAR interferograms in space domain, the idea of ​​two methods of adaptive center weighted median filtering and optimal direction filtering, and proposes an adaptive center-weighted median filtering method based on optimal direction. Analyzed the index and its insufficiency of edge retention index, and proposed the improved index of edge retention index. The experiment results show that the new filtering method not only has better noise smoothing effect, but also has strong edge and detail information holding ability.