Based on RS-derived maps and socio-economic statistics,this paper analyzed the spatiotemporal dynamic pattern and driving mechanism of built-up area expansion in Su-Xi-Chang region from 1990 to 2010. 3S-based spatial analysis techniques were used,landscape expansion indices were calculated,and multiple stepwise regression models were also used. In the past 20 years,the built-up area had experienced rapid-moderate-accelerating expansion stages,which was strongly affected by the national development strategie...