In this study, we performed monitoring of surface deformation before and after the 2006 eruption of Augustine volcano using GPS and InSAR techniques. The results of the GPS data processing clearly indicate inflation (9.7 cm/yr) and deflation (-9.2 cm/yr) around volcano crater. In addition, beginning in September, 2005, we can observe the extension of AV02 and AV03 baseline which is spanning Augustine"s summit from north to south. Especially, we can verify the subsidence phenomenon at north slope of Augustine volcano as a result of InSAR. These deformations are considered as the compaction effect of extrusive pyroclastic material at 1986 and 2006 eruptions. This result shows the possibility of integration of GPS and InSAR for monitoring and prediction of volcano activity.