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This paper presents a broad-range study of the co-seismic deformation field of Wenchuan Ms8.0 earthquake by ScanSAR interferometry. The results show co-seismic displacements ranging from - 19. 8 on the footwall side of the seismogenic fault to 73.6 cm on the hanging-wall side, or from - 22. 4 to 77.2 cm with atmospheric-delay correction by MODIS. These results differ from the GPS line-of-sight results by 4. 58 cm to 2. 78 em, respectively, on the average. We could not obtain the displacements near the earthquake-rupture zone due to incoherence problem.