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Crustal movement and incremental-movement data observed repeatedly at GPS stations during 1999 -2009 were analyzed to study the effect of two earthquakes of Ms8.1 and Ms8.0 that occurred in 2001 and 2008,respectively,in Qinghai-Tibet sub-plate and its eastern margin.The result revealed certain anomalous pre-earthquake deformation and some large co-seismic changes.Prior to the 2008 Wenchuan Ms8.0 earthquake,the seismogenic Kunlunshan fault zone became a geographic boundary between different regional movements.At the time of the earthquake,there was an average cross-fault crustal shortening of - 1.04 m and an average right-lateral strike slip of 0.76 m along the ruptured segment,as well as a strain-energy release of - 62.66 × 10.7.