Multi-temporal satellite remote sensing images were used,in combination with RS-GIS integration technology,to calculate and analyze coastline changes of the Pear River Estuary (PRE).The coastline’s responses to natural factors such as sea-level rise and sediment supply and human actives are analyzed.The results show that offshore coastline extends seaward by 579.2 m,with an extension rate of 19.3 m/a from 1976 to 2006. Moreover,during the same period,open-sea island coastline only extends seaward 21.6 m with an extension rate of 0.7 m/a,which suggest that extension rate of offshore coastline is much faster than by natural aggradation process.Sea-level rise,seem to have minor impacts on the dramatic changes of coastlines of the PRE.The increasing trend of coastline extension rate does not agree with the decreasing trend of the sediment supply from upstream in the 1990s.A detailed comparative analysis indicates that land reclamation is the most dominant factor that controls the observed coastline changes.