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Seismic intensity (SI) is an important reference index for understanding disaster situations, establishing emergency rescue plans and performing loss assessments after an earthquake. In this paper, we investigated the feasibility of assessing SI through interferometric synthetic aperture radar (InSAR) data after the Wenchuan earthquake on May 12, 2008, in China. The proposed approach relies on pre-existing residential data to obtain the regional seismic deformation corresponding to blocks. Theoretical maximum and minimum values analysis was carried out according to seismic attenuation relationships, and the deformation points were classified using Jenks natural breakpoints. The deformation field data were used to evaluate the epicenter and periphery areas. Instrument-based intensity values of stations were included in our analysis and used to investigate the periphery of the study area. Classification results of deformation field and instrument-based intensity values were combined to form a complete deformation field. The effectiveness of the method was verified based on a case study of the Yushu earthquake, another severe earthquake in China.