Abstract：In order to mitigate the negative effect of ionosphere signal on SAR observed azimuth deformation and extract fault rupture trace for the Wenchuan earthquake, we model the ionosphere signal using the frequency component recognized in the frequency domain of original SAR azimuth deformation field. The accurate coseismic azimuth deformation is derived after removing the ionosphere component from the original observations. We extract the Yingxiu-Beichuan and Pengguan faults surface rupture traces from the corrected SAR azimuth deformation field based on the proposed method that restricts the non-peak deformation gradient along the fault. The field investigation data are introduced for validating the accuracy of extracted fault surface rupture traces. The comparison results show that two datasets have high consistence with each other. The corrected SAR deformation field could be a significant supplement for the investigation of fault surface rupture traces.